A brain of the proper temperament has its vital energies and excretions moderate, and is not liable to be affected by any externals. Such persons, when infants, have the hair of their head somewhat tawny—when boys, yellowish—and when adults, a bright yellow; being also intermediate between the curly and the straight, and they do not readily fall out. When the temperament is hotter than moderate, all the parts about the head are hotter and redder, the veins in their eyes are perceptible, their hair is grown at birth; and if much hotter, it is black, strong, and curly; but if not much, it is yellowish at first, and then grows black, and in more advanced life such persons become bald; their excretions are small when they enjoy good health; their head becomes filled and oppressed by heating food, drink, and odours, or by any external casualties. Such temperaments are satisfied with little sleep, and even that is generally not profound. The following are the marks of a brain which is colder than proper: The excretions are excessive; the hairs are straight, yellow, and durable; and it is hurt readily by cold things. Such persons are constantly seized with catarrhs and defluxions, the veins of their eyes are not visible, and they are much given to drowsiness. The following are the marks of a brain which is drier than natural: In the excretions nothing redundant, the senses acute, not being given to drowsiness, the hair strong and soon formed, rather curly, and soon falling out. In the more humid temperament, the hairs are straight, do not readily drop out; the senses are muddy, and the excretions redundant, sleep long and profound. In the compound of the hot and dry, the excretions of the head are small, the senses acute, there is a disposition to watchfulness, and baldness. Their hair at first is formed quickly and abundantly, is of a black colour, hot to the touch, and they are ruddy until manhood. But if moisture be joined to heat, and they are not immoderate, the colour and heat are good, and the veins of the eyes large. The excretions are plenteous and moderately concocted. The hair is straight and yellowish, and does not readily drop out. The head is easily filled and oppressed by heating and moistening things. But should an increase of humidity and heat take place, the head becomes diseased, and easily affected by heating and diluent things. Such persons cannot endure long watchfulness, but their sleep is disturbed by fantastical dreams, their sight is dim, and their senses not distinct. The cold and dry temperaments of the brain conjoined together render the head cold and pale, the veins of their eyes do not appear, and they are readily hurt by cold things: wherefore, their health is precarious. Their senses in youth are distinct and faultless, but as they advance in life soon decay. In a word, as far as regards the head, they experience a premature old age; their hair after birth is of slow growth, stunted, and tawny. The humid and cold temperaments of the brain render those affected with them prone to lethargy and drowsiness; their senses are bad; they abound with recrementitious humours; are easily affected with cold and fulness of the head; and are liable to catarrhs and defluxions; but such persons do not readily become bald.
Commentary. This is taken from Oribasius (Synops. v, 46), who abridges Galen. (Ars Med.)
As our author’s description of the temperaments is sufficiently intelligible, and the others, whether Greeks or Arabians, deliver exactly the same views of the subject, without any material improvement, we consider it unnecessary to multiply references to, and extracts from them, on the present occasion; and, therefore, instead of crowding our pages with superfluous repetitions, we shall give in this, and the five following Sections, a brief exposition of the physiological doctrines of the ancients, with regard to the principal organs of the human body:
The ancients divided the powers or faculties of the human body into the Natural, the Vital, and the Animal. The brain they held to be the seat of the animal powers—that is to say, they considered it to be the organ from which sensation and motion are derived, and these, they maintained, are the powers by which animals are distinguished from vegetables. This doctrine is fully explained by Galen, in his work, ‘De Facultatibus Naturalibus,’ and by several of the Arabian authors, among whom we will venture to mention Haly Abbas, as being particularly worthy of being consulted on this subject. The brain, then, was accounted the seat of the five external senses, and of muscular motion, which also was reckoned as one of the senses by Hippocrates. (De Insomniis, c. 1.) Galen and his followers decidedly taught that the nerves of the senses are distinct from those which impart the power of motion, that the former derive their origin from the anterior part of the brain or cerebrum, and the latter from the posterior, called by the Greeks encephalis (under this term they comprehended the cerebellum, tuber annulare, and medulla oblongata of modern anatomists), or from its process, the spinal cord. They maintained that the nerves of the finer senses are formed of matter too soft to be the vehicles of muscular motion; whereas, on the other hand, the nerves of motion are too hard to be susceptible of fine sensibility. See Galen (de Usu Partium, ix; de Administ. Anat. vii); Haly Abbas (Theor. iv); Averrhoes (Collig. iii, 33); Avenzoar (ii, 7); and Rhases (Contin. i.)
The ancients were also of opinion that the brain is the coldest viscus in the animal frame, being in this respect the antagonist of the heart, the heat of which they supposed that it counteracts. See Aristot. (De Part. Anim. ii, 7); and Pliny (Hist. Nat. xi, 49.) There appears to be some foundation for this opinion, since, as is remarked by Haly Abbas, those parts of the body which are vascular, and contain much blood, are naturally hot; whereas such as contain little blood are comparatively cold. Of this latter class are the brain, nerves, and fat. (Theor. i.)
The later Greek authorities, as, for example, Theophilus Protospatharius and Nemesius, adopt a division of the brain as regards its connexion with mind, to which Galen and his immediate followers appear to have been strangers. According to it, Fantasy is connected with the anterior part of the brain; Cogitation, or the discursus mentis, with the middle; and Memory with the posterior. See, in particular, Theophilus (p. 184, ed. Greenhill.) This hypothesis was received by all the Arabian writers on medicine. See, for example, Averrhoes (Collig. ii, 20.) It was evidently an approach to the arrangement adopted by the phrenologists of the present day, who maintain that intellect is seated in the anterior part of the brain; the moral feelings in the middle; and the animal appetites in the posterior.
SECT. LXIV.—THE MARKS OF THE TEMPERAMENTS OF THE STOMACH.
The marks of a preternatural dryness of the stomach are, that those affected with it are liable to thirst, but little drink satisfies them; and they feel heavy with much drink, as the superfluity occasions gurgling in the stomach, or floats upon it; of those of a more humid, that they are not addicted to thirst, and bear readily much liquids, and rejoice in humid food. A stomach preternaturally hot has a better digestion than appetite, particularly with regard to those things which are hard and difficult to digest; it delights in much food and drink; neither is it hurt by the moderate use of cold things. A preternaturally cold stomach has a good appetite but not a good digestion, in particular with regard to such things as are of difficult digestion, and are of a cold nature, which therefore are apt to turn acid in it. And it delights indeed in cold things, but is readily hurt by the immoderate use of them. The intemperaments proceeding from disease differ from the congenital in this, that they long for opposite things, and not always alike. If the stomach then digests properly, it is of a moderate temperament; and if it does not it is of a bad; but if its eructations are fetid, its heat is inordinate and inflammatory; but if acid, the contrary. And in those who digest properly things of difficult digestion, the heat of the stomach is inordinate, and weak in those who cannot digest those things, but digest fishes. It must also be observed, whether or not the symptom is occasioned by any humour flowing from another part; for in pituitous constitutions acid eructations are apt to occur; but in the bilious, fetid airs and other disagreeable qualities are apt to prevail. The common symptom of them all is nausea. If the depraved humours swim within the cavity of the stomach, they float on the surface, and are discharged by vomiting; but if they are contained in the substance of it within its coats, they annoy it with vain attempts to vomit.
Commentary. We shall now state briefly the opinions of the ancients with regard to the functional office of the stomach.
Actuarius says, “I am of opinion, that there are four species of concoction which are performed in different parts of the body: the first in the stomach; the second in the vena ramalis (vena portæ?), meseraic veins, and concave part of the liver; the third in the convex part of the liver and veins proceeding from it; and the fourth, consisting of fabrication or assimilation, which takes place in the extreme parts of the body.” (De Urinis.) The various modes of change or concoction which the food undergoes in the body, are minutely described by Macrobius. (Saturnal. vii.) In another place, Actuarius says, “Digestion is performed by moderate heat and moisture.” (De Spiritu Animali, p. ii, s. 1.) Alsaharavius in like manner states, that the digestive faculty depends partly on the heat, and partly on the humidity of the stomach. (Pract. tr. xvi, c. 1.) It is impossible not to see that the gastric juice is alluded to in these passages. It is particularly stated of Asclepiades, that he held digestion to be the solution of the food. See C. Aurelianus. (Morb. Acut. i, 14.) And that the ancients were aware that the stomach secretes a fluid possessed of solvent properties, is put beyond a doubt, by the following extract from the works of Haly Abbas. Speaking of the changes which the food undergoes in the mouth and stomach, he says: “Immutantur cibi in ore, retinenturque, et flegmati admiscetur quod digestum est, calorque ei datur. Quod autem flegma hoc hujusmodi sit, signum nobis est quod impetigines et sarpedones curat, quædam maturat ulcera, scorpiones necat. Hac ergo de causa et in ore cibus immutatur. Sic et stomachus ipsum immutat: ejus etenim circum amplectitur substantia, quasque habet imprimit qualitates, immutaturque ipsius naturali calore cibus: Sed et quoniam cibus ipse in eo flegmati admiscetur humido.” (Theor. iv, 3.) The whole bearing of this passage, but more especially the last clause, puts it beyond a doubt that the process of digestion was supposed to be performed, in a certain measure, by the solvent powers of a fluid secreted in the stomach. And the ingenious Alexander Aphrodisiensis, in like manner, treating of the digestion of mustard, pepper, and other acrid substances, says decidedly, that their acrimony is dissolved in the copious fluid of the stomach. (Probl. i, 30.) See also Macrobius (Saturnal. vii, 8.) He calls the fluid ventralis humor, which may be literally translated, “gastric juice.” Part of the process was, no doubt, supposed to be performed indirectly by heat; and deservedly, for even Spallanzani was compelled to admit, that the comparative temperature of animals exerts a considerable influence on their digestive powers. Hence, as was stated by Averrhoes, and as is confirmed by Cuvier, Birds, which are the warmest class of animals, likewise digest the fastest. At all events, the ancients were well aware, that digestion is not a mechanical, but a vital process, being performed by the principle of life. “Digestion,” says Averrhoes, “is performed by concoction, and the concoction is influenced by heat, not that the first mover in the operation is heat, but the nutritive soul; because the operations of heat are indeterminate, and not directed to any manifest end.” (Collig. v, 3.) In the ‘Averroeana’ or ‘Letters from Averrhoes to Metrodorus,’ (which, whether genuine or not, contain a curious and interesting exposition of the Great Commentator’s opinions on various subjects, and at all events must be of considerable antiquity,) the doctrine of a gastric menstruum is discussed with singular ability. Metrodorus states, that “he found, by the writings of the physicians and philosophers of these times, that they make the menstruum, as they call it, whereby both appetite is provoked, and food in the stomach is digested, to be a certain juice or humour in the stomach,” &c. Averrhoes denies that this menstruum acts by its acidity alone.