42 · Why is it that drugs have a purgative effect, while other things, though they surpass them in bitterness and astringency and other such qualities, do not [25] have this effect? Is it because the purgative effect is not due to these qualities but to the fact that they are unconcocted? For anything which, though small in bulk, owing to its excessive heat or cold is unconcocted and of such a nature as to overcome, and not be overcome by, animal heat, if it is easily dissolved in the two [30] stomachs, is a drug. For when such drugs enter the stomach and become dissolved, they are carried into the vein by the ducts through which the food passes, and, not being concocted but themselves prevailing, they make their way out, carrying with them anything which gets in their way; and this is called purging. Bronze and silver [35] and the like, although they are not concocted by animal heat, are not easily dissolved in the stomach. Oil and honey and milk and other such foods have a [864b1] purgative effect; but this depends, not on any quality which they possess, but on quantity; for, if they act as a purge, they only do so when they are unconcocted owing to their quantity. For things can be unconcocted for two reasons, either because of their quality or because of their quantity. So none of the above-mentioned [5] foods are drugs, because they do not purge owing to their quality. Astringency and bitterness and unpleasant odour are characteristic of drugs, because a drug is the opposite of a food; for that which is concocted by a natural process amalgamates with the body and is called a food; but that whose nature it is to refuse to be overcome and which enters into the veins and causes disturbance [10] there owing to its excess of heat or cold, this is of the nature of a drug.
43 · Why is it that pepper if taken in large quantities relaxes the bladder, but if taken in small quantities affects the stomach, whereas scammony if taken in large quantities relaxes the stomach, but if taken in small quantities and when it is [15] old affects the bladder? Is it because each has more effect on one part of the body? For pepper promotes urine, while scammony is purgative. Pepper therefore if taken in large quantities is carried into the bladder and does not dissolve in the stomach, but if taken in small quantities it is overcome and relaxes the stomach and acts upon it as a drug. Scammony, on the other hand, if it is taken in large quantities, is [20] overcome to such an extent that it is dissolved, and being dissolved it becomes a drug for the reason mentioned above; but, if it is taken in small quantities, it is swallowed with what is drunk and passes into the ducts and is quickly carried into the bladder before it can cause any disturbance, and there by its own force it carries off all the [25] excretions and liquefactions which are on the surface. When it is taken in large quantities, as has already been remarked, owing to its strength it remains a long time in the stomach and effects an extensive purgation of the earthy element.
44 · Why do some cure by cooling the same inflammations which others bring to a head by heating them? Surely it is because the latter collect the inflammation by applying external heat, the former by cooling the heat already [30] present in the body.
45 · Why is it necessary to change poultices? Is it in order that6 they may be more felt? For as, in things which we eat, that to which we have grown accustomed no longer acts as a drug but becomes a food, so poultices lose their effect. [35]
46 · Why does it promote health to reduce one’s diet and increase one’s exercise? Is it because an excess of excretion causes disease, and this occurs when [865a1] we take too much nourishment or too little exercise?
47 · Why is it that drugs, and bitter and evil-smelling substances generally, have a purgative effect? Is it because anything which is evil-smelling and bitter does not admit of concoction? Drugs therefore are bitter and evil-smelling; for they are [5] drugs because, in addition to being bitter, they do not admit of concoction and can cause motion; and if they are administered in too large doses, they are destructive of life. But substances which are destructive of life even if given in small quantities are not drugs but deadly poisons. Nor again do we give the name of drugs to those substances which are not purgative through their natural qualities; for indeed many [10] foods have the effect of drugs, if taken in sufficient quantity—milk, for example, and olive oil and unfermented wine; all these things, because they are not easily concocted, have a purgative effect on those by whom they are not easily concocted. For different things are easy or difficult of concoction to different people; and so the same things do not act upon every one as drugs, but particular things act upon certain people. For, generally speaking, a drug ought not only to be difficult of [15] concoction, but also ought to have the power to produce movement; just as also exercises, whether external or internal, expel alien matter.
48 · Why is it that sweet-smelling seeds or plants promote the flow of urine? Is it because they contain heat and are easily concocted, and such things have this [20] effect? For the heat in them causes quick digestion, and their odour has no corporeal existence; for even strong-smelling plants, such as garlic, promote the flow of urine owing to their heat, though their wasting effect is a still more marked characteristic; but sweet-smelling seeds contain heat.
49 · Why is it that unclean and foul sores require to be treated with dry, [25] pungent, and astringent drugs, while clean, healthy sores require moist, porous7 remedies? Is it because something must be drawn out from unclean sores, and it is foreign moisture which must be extracted? Now biting, pungent, and astringent [30] substances have this effect, and the dry rather than the moist. Clean sores, on the other hand, only require to skin over.
50 · Why is it that sexual excess is beneficial to diseases caused by phlegm? Is it because the semen is the secretion of an excrement and in its nature resembles phlegm, and so sexual intercourse is beneficial because it draws off a quantity of phlegm-like matter?
[35] Is it better to give the patient nourishment at first or later? Ought nourishment to be given at the beginning, so that the inflammation, when it sets in, may not find the patient already weak? Or ought the patient to be reduced at once? Or ought the following to be the treatment, namely, that the patient should first take nourishment [865b1] in the form of draughts, since food of this kind is milder and more readily swallowed and dissolved, and it is easier for a sick person to receive nourishment from this sort of food? For where8 the food has first to be acted upon in the stomach,—namely, both dissolved and heated—these processes cause pain to the [5] body.
51 · Why is it that, in order to examine urine to see if it is concocted, one must stop the flow of urine rather than continue to pass it? Is it because it is a sign of concoction if it is reddish in colour, and this is better detected if the flow is stopped? [10] Or is it because anything that is liquid forms as it were a better mirror of its colour in a small than in a large quantity? For form is better discerned in a large quantity, but colour in a small quantity, in dew, for example, and drops of rain and tears on the eyelids. If urine, therefore, is allowed to flow it becomes greater in quantity, but, [15] if it is checked, it takes on colour more readily; and so if it has already taken on this character by concoction, this can be better observed if the flow of urine is stopped and light thus refracted and a mirror formed.
52 · Why should the flesh be made rare rather than dense in order to promote health?9 For just as a city or locality is healthy which is open to the breezes [20] (and this is why the sea too is healthy), so a body is healthier in which the air can circulate. For either there ought to be no excrement present in the body or else the body ought to get rid of it as soon as possible and ought always to be in such a condition that it can reject the excrement as soon as it receives it, and be in a state of motion and never at rest. For that which remains stationary putrefies (standing [25] water, for example), and that which putrefies causes disease; but that which is rejected passes away before it becomes corrupt. This then does not occur if the flesh is dense, the ducts being as it were blocked up, but it does happen if the flesh is rare. One ought not therefore to walk naked in the sun; for the flesh thereby solidifies and [30] acquires a
n absolutely fleshy consistency, and the body becomes moister; for the internal moisture remains, but the surface moisture is expelled, a process which also takes place in meat when it is roasted rather than boiled. Nor ought one to walk about with the chest bare; for then the sun draws the moisture out of the best constructed parts of the body, which least of all require to be deprived of it. It is rather the inner parts of the body which should be submitted to this process; [35] because they are remote, it is impossible to produce perspiration from them except by violent effort, but it is easy to produce it from the chest because it is near the surface.
53 · Why is it that both cold and hot water are beneficial to chilblains? Is it [866a1] because chilblains are caused by an excess of moisture? If so, the cold water thickens and hardens the moisture, while the hot water causes it to evaporate and enables the vapour to escape by rarefying the flesh.
54 · Why is it that cold both causes and stops chilblains, and heat both [5] causes and stops burns? Is the cause the same in both cases, namely, that they cause them by setting up liquefaction and stop them by drying them up?
55 · In fevers liquid nourishment ought to be administered often and in small quantities. For a large quantity flows away and is wasted, but a small quantity taken frequently sinks in and penetrates into the flesh. For as the rain, if it comes [10] down upon the earth in torrents, runs to waste, but, if it comes down in small quantities, merely moistens the ground; so the same thing occurs in fever patients. In irrigation, if the water is allowed to flow gradually, the channel sucks it up; whereas, if the same amount of water is allowed to flow all at once, it makes its way wherever it is directed.
Next the patient ought to lie as still as possible, because fire also obviously dies [15] down if one does not stir it. And he ought not to lie in a draught, because the wind stirs up the fire, and, being fanned, it becomes great instead of small. For this reason the patient ought to be well wrapped up, because fire is extinguished if it is not [20] allowed to draw in air; and the garments ought not to be removed until damp heat is present, for the fire if exposed to the air dries up the moisture—just as happens also in nature.
In the case of intermittent fevers one must make preparations beforehand by washing10 the patient and applying fomentations to his feet, and he must rest well [25] wrapped up, in order that there may be as much heat as possible in him before the attack begins. For a flame will not be able to burn where there is a great fire; for the great fire will absorb the little fire. Consequently a great fire must be prepared beforehand in the body; for fever has but little fire in it, and so the great fire will absorb the little fire. [30]
56 · In quartan fevers the patient must not be allowed to get thin, and heat must be introduced and engendered in his body. Exercises must also be employed. On the day on which the attack is expected he must bathe himself and avoid sleep. A heating diet is beneficial, because a quartan fever is weak; for if it were not so, it [35] would not occur only every fourth day. For, mark you, where there is a great fire, a flame cannot burn; for the great fire attracts and absorbs the little fire. For this [866b1] reason it is necessary to engender great heat in the body, because fever has but little fire in it. The daily treatment consists in introducing at one time heat and at another time moisture into the body. Some diseases are caused by heat, others by moisture; those which are caused by heat are cured by moisture, and those which are due to [5] moisture are cured by heat, for heat dries up moisture.
BOOK II
PROBLEMS CONNECTED WITH PERSPIRATION
[10] 1 · Why is it that perspiration is caused neither when the breath is expanded nor when it is held in, but rather when it is relaxed? Is it because, when it is held in, the breath fills out the veins and so does not allow the perspiration to escape, just as the water in a water clock cannot escape if you turn it off when the clock is full? But when the perspiration does come out, it does so in great abundance, because it has gradually collected during the actual period that it has been checked.
[15] 2 · Why is it that the parts of the body that are immersed in hot water do not perspire, even though they are themselves hot? Is it because the water prevents liquefaction, while perspiration is formed when matter which is not properly attached to the flesh1 is expelled by heat?
3 · Why is perspiration salty? It is because it is caused by movement and [20] heat which rejects any foreign matter in the process by which nourishment passes into blood and flesh? For such matter quickly separates, because it has no affinity with the body, and evaporates externally. It is salty because the sweetest and lightest part of the food is taken up by the body, while the unsuitable and [25] unconcocted part is discharged. This when it is excreted below is called urine, in the flesh it is sweat; both of these are salty for the same reason.
4 · Why is it that the upper parts of the body perspire more freely than the lower? It is because heat rises upwards and remains there, and this carries the [30] moisture upwards? Or is it because breath causes sweat, and the breath is in the upper parts of the body? Or is it because sweat is unconcocted moisture, and such moisture resides in the upper parts because the process of its composition takes place there?
5 · Why is it that sweat is produced most copiously if we exercise the arms while we keep the other parts of the body in the same position? Is it because we have most strength in this region of the body? For it is in this region, which is nearest to [35] the strongest part of us, that we hold our breath; and we gain strength by violent exertion, and, having gained strength, we can hold the breath more easily. Furthermore, we feel the effect of friction more in the arm than when any other part [867a1] of the body is rubbed; for it is by holding the breath that we get exercise, both when we are rubbed and when we rub.
6 · Why is it that sweat given off from the head either has no odour or less than that from the body? Is it because air circulates freely in the region of the head? [5] That the head possesses rarity is shown by the fact that it produces hair. And it is those regions of the body and the substances of which they are composed through which the air does not circulate that are malodorous.
7 · Why is it that those who take athletic exercise, if they wrestle after a period of rest, perspire more freely than if they wrestle continuously? Is it because the sweat collects while they are resting, and then the wrestling afterwards brings [10] out this sweat? Continuous exercise, on the other hand, dries up the sweat, just as does the heat of the sun.
8 · Why is it that one sweats more freely if one has not for a long time employed means to induce perspiration? Is it because sweat is not caused by moisture alone, but is also due to the fact that the pores are opened wider and the [15] body becomes porous? In those, therefore, who take no measures to induce perspiration the pores become closed up, whereas if they do take such measures the pores are kept open.
9 · Why is it that, although the sun warms those who are naked more than those who are clothed, the latter perspire more freely? Is it because the sun by burning causes the pores to close up? Or is it because it dries up the moisture? [20] These processes are less likely to happen in those who are clothed.
10 · Why is it that the face gives off the most perspiration? Is it because the sweat can find a way out through parts which are particularly porous and moist? Now the head seems to be the source of moisture, and it is owing to the presence of [25] copious moisture that the hair grows; and the region of the head is rare and porous, and so the sweat naturally finds a way out.
11 · Why is it that one perspires most freely, not when the heat is applied all at once or when it is gradually diminished, but when it is gradually increased? For those who are in vapour baths perspire under these conditions more freely than if all [30] the heat be applied at once. Is it because it is the presence of anything in proper proportions which produces each required effect, and so, if it produces this effect, its presence in greater quantity will not produce a greater effect, or will rather produce the contrary effect, for it is because a thing
is proportionate that it produces a certain effect? For this reason then increased perspiration is not induced as the result of greater heat; but because to each increment of heat there answers a [35] different proportion, and that which has already produced its effect produces no greater effect, increased perspiration is rather the result of successive additions of heat. For it is not the same cause which prepares the way and creates a favourable condition for a series of effects and then begins to produce the effect, but a different cause. So a small quantity of heat prepares the way and predisposes the body to [867b1] perspire better than a large quantity; but another and a greater proportion is required actually to produce the perspiration, but this does not continue to produce the effect which it originally produced, but must be followed by another application of heat different again in its proportions.
12 · Why does the sweat flow more freely if a scraper be used than if it be [5] allowed to remain on the body? Is it because the presence of external sweat induces cooling? Or is it because the external sweat forms as it were a lid over the pores and so prevents the movement of the internal sweat?
13 · Why is it that rue and certain unguents give the perspiration an evil [10] odour? Is it because things which have a heavy scent, mixing with the excretory fluids, make the odour of these still more unpleasant?
The Complete Works of Aristotle Page 231
