outposts as a spy, being disguised as a peasant without a knowledge of the language, he received a severe bastinado, which effectually cured him of an appetite for secret service, and on his return he had recourse to the safer means of obtaining food in kitchens, slaughter-houses, and dunghills. At last, a child of fourteen months old having disappeared under suspicious circumstances, he was driven out of the hospital, and lost sight of for four years, when he applied for admission into the hospital of Versailles, in a state of complete exhaustion, labouring under a violent diarrhoea, which terminated his hateful existence in his twenty-sixth year. He was of the middle size, pale, thin, and weak; his countenance was by no means ferocious, but, on the contrary, displayed much timidity; his fair hair was remarkably fine and soft; his mouth was very large, and one could scarcely say that he had any lips; all his teeth were sound, but their enamel was speckled; his skin was always hot, in a state of perspiration, and exhaling a constant offensive vapour. When fasting, the integuments of his abdomen were so flaccid that he could nearly wrap them round him. After his meals the exhalation from his surface was increased, his eyes and cheeks became turgid with blood, and, dropping into a state of drowsiness, he used to seek some obscure corner where he might quietly lie down and digest. After his death, all the abdominal viscera were found in a state of ulceration.

Instances are recorded where a similar facility to swallow fluids had been observed. At Strasburg the stomach of a hussar was exhibited who could drink sixty quarts of wine in an hour. Pliny mentions a Milanese, named Novellus Torquatus, who, in presence of Tiberius, drank three congii of wine. Seneca and Tacitus knew a man of the name of Piso who could drink incessantly for two days and two nights; and Rhodiginus mentions a capacious monster called the Funnel, down whose throat an amphora of liquor could be poured without interruption.

To what are we to attribute these uncommon, nay, these unnatural faculties? Neither physiological experiments during life, nor anatomical investigation after death, have hitherto enabled us to form an opinion. Great as the progress of science has been, we are still doubtful as to the nature of the digestive process. All the hypotheses on the subject are liable to insuperable objections. Hippocrates and Empedocles attributed digestion to the putrefaction of food. Experiments have clearly demonstrated the fallacy of this doctrine: rejected food is never in a state of putridity; on the contrary, meat in a perfect state of putrescence has been restored to sweetness and freshness on being received into the stomach. Dead snakes have been

found with animal substances, part of which had been swallowed and the remainder hanging out of their mouths; when the swallowed portion was fresh, and the portion exposed to the atmosphere in a state of corruption. Galen, and after his school, Grew and Santarelli, ascribed digestion to a concoction, during which, food was maturated by the stomach's heat, like fruit by the solar rays. Pringle and Macbride advocated the doctrine of fermentation; while Borelli, Keil, and Pitcairn resolved the question by the mechanism of trituration, making a mill of the stomach, which ground down food, according to Pitcairn's calculations, with a pressure equal to a weight of one hundred and seventeen thousand and eighty pounds. Boerhaave endeavoured to reconcile the opinions of the concocters and grinders, by combining the supposed theory of concoction and trituration. Lastly, Cheselden fancied that digestion was operated by a peculiar secretion in the stomach, called gastric juice; and Haller, Réaumur, Spallanzani, Blumenbach and most other modern physiologists, concur with him in the same opinion, although admitting that this function is most probably assisted by various accessory circumstances.

This juice was found, upon experiment, to be endowed, not only with the antiseptic power of preserving the contents of the stomach from putrefaction, but with the property of being a most powerful solvent. Pieces of the toughest meats and bone have been enclosed in perforated metallic tubes, and thrust down the stomach of carnivorous birds, and in the space of about twenty-four hours the meats were found to be diminished, or, in other words, digested to three-fourths of their bulk, while the bones had totally disappeared. Dr. Stevens had recourse to a similar experiment on the human stomach, by means of a perforated ivory ball, and with the same result. The gastric juice of the dog dissolves ivory; and that of a hen has dissolved an onyx, and diminished a golden coin. Not long since, upon examining the stomach and intestines of a man who died in a public-house, he was found to have been a polyphagous animal, since several clasp-knives that he had swallowed were discovered with their blades blunted and their handles consumed. these experiments, however, Dr. Montegre of Paris, who was gifted with the faculty of discharging the contents of his stomach at will, has fully proved that this gastric juice, when not in an acid state, is subject to putrefaction when submitted to external animal heat; that this corruption did not occur when an acid prevailed, and saliva intermixed with vinegar was equally free from a similar decomposition. He moreover asserts, that he had recourse to numerous experiments to digest food

Since

artificially in this supposed solvent, but without obtaining results similar to those advanced by Spallanzani; and, finally, he found little or no difference between the gastric juice and saliva. This acid, which generally exists in the gastric juice, has been ascertained by Dr. Prout to be the muriatic, both free and in combination with alkalis: while Tiedemann and Gmelin maintain that, in its natural state, no acid is to be met with; but that, when food is commingled, an acid which they consider the acetic acid is produced in considerable quantity.*

The ostrich, that may be considered a connecting link between birds and quadrupeds, is gifted with powerful digestive organs, and is known to swallow stone, glass, and iron; but this faculty appears to be a gift of all-bounteous Providence, to enable the creature to digest the various substances it meets with when traversing burning deserts for hundreds of miles, when these hard bodies actually perform the function of teeth in the animal's stomach, by aiding the comminution of its indigestible food. The structure of the ostrich has a near resemblance to that of the camel, destined to perform the same dreary journeys. The wings are not designed for flight, and in speed he equals the horse. Adanson affirms that he had seen two ostriches at the factory of Podore, that were broken in to carry single or double riders, and the strongest and youngest would run more swiftly with two negroes on his back than the fleetest racer.

Spallanzani endeavoured to prove that the pebbles and gravel swallowed by various birds were of no use in the process of digestion; but Hunter, who had found two hundred pebbles in the gizzard of a turkey, and one thousand in that of a goose, demonstrated their utility in the trituration of their food, since these birds were found to be unable to digest, and consequently to thrive upon their nourishment when deprived of this mechanical aid. It is curious that the owl, which easily digests meat and bones, cannot be made to digest bread or grain, and yet dies if confined to animal food. The eagle, and other birds of prey, can dissolve both. A singular process of digestion is observed in the stormy petrel, which lives entirely on oil and fat substances whenever it can obtain them; but when fed with other articles of food, Nature, true to her laws, converts them into oil; the bird still discharges pure oil at objects that offend him, and feeds his young with the same substance. The petrel must, no doubt, be a bilious subject, for he delights in misery, and his

*On this subject see what has been already said in the preceding article of Food, its use and abuse, in Dr. Beaumont's experiments.

presence is a sure presage of foul weather to the experienced seamen; and when

The wrathful skies

Gallow the very wanderers of the dark,

And make them keep their caves,

he is seen riding triumphantly on the whirlwind, and skimming the deepest chasms of the angry waves. This bird is said to be named petrel' from Peter, since, like that saint, he is supposed to have the power of walking on the waters.

The singular appetites which have been noticed seem to have been individual peculiarities, uninfluenced by a morbid condition; but there are cases in which a depraved appetite is symptomatic of disease, where we see persons otherwise possessed or sound judgment longing, not only for the most improper and indigestible food, but for substances of the most extraordinary and even disgusting nature. Thus we have seen patients, more especially young females and pregnant women, devouring dirt, cinders, spiders, leeches, hair, tallow, and paper. An ingenious writer affirms that "more literature in the form of paper and printed books has been thus devoured, than by the first scholars in Christendom."

Dr. Darwin tells us that he saw a young lady about ten years of age that used to fill her stomach with earth out of a flowerpot, and then vomited it up, with small stones, bits of wood, aad wings of various insects. John Hunter has described an endemic disease among the Africans in Jamaica, in which they devoured dirt. Mason Good, when speaking of this affection, says, "that the longing for such materials is, in this disease, a mere symptom, and rarely shows itself till the frame is completely exhausted by atrophy, dropsy, and hectic fever, brought on by a longing of a much more serious kind,-a longing to return home, a pining for the relations, the scenes, the kindnesses, the domestic joys, of which the miserable sufferers have been robbed by barbarians less humanized than themselves, and which they have been forced or trepanned to resign for the less desirable banquet of whips, and threats, and harness, and hunger."

Roderic à Castro relates the case of a lady who could eat twenty pounds of pepper, and another who lived upon ice. Tulpius mentions a woman who, during her pregnancy, longed for salt herrings, and ate fourteen hundred at the rate of five herrings per diem. Longius affirms that a lady in Cologne, who was in that state that ladies wish to be who love their lords, took such a fancy to taste the flesh of her husband that she actually assassinated him, and, after indulging in as

much fresh meat as the weather permitted, salted the remainder for further use. This cannibal inclination seems not to be uncommon. The said Roderic à Castro knew a woman in the same thriving condition, who felt an inexpressible desire for a bit of the shoulder of a neighbouring baker, and her husband was persecuted by her constant prayers and lamentations to prevail on the worthy man to allow her one bite for charity's sake but the first bite was so heartily inflicted, that the crusty baker would not submit to a second.

In the Philosophical Transactions there is a case related of a woman whose fancies were not quite so solid, and who used to gratify her aerial appetites by putting the nozle of a bellows down her throat, and blowing away until she was tired. These longings of parturient women are most common; but it is rather curious, that, among our negroes in the West Indies, the husbands pretend to long for their wives, and endeavour to gratify them by proxy. Possibly such might have been the fancy of Cambes, the Lydian prince, who, according to Elian, took it into his head one night to eat up his beloved wife.

CAUSES OF INSANITY.

MADNESS is attributed to moral and physical causes. Physicians do not agree as to the prevalence of either of these sources of human misery. Some of them, most unjustly accused of materialism, seem to lean to the opinion that, generally speaking, physical causes can be traced in post mortem examination; while others, equally skilled in accurate anatomical investigations, maintain that these organic derangements are very seldom met with.

Lawrence affirms that he had "examined after death the heads of many insane persons, and had hardly seen a single brain which did not exhibit obvious marks of disease;" and he further states, "that he feels convinced from his own experience, that very few heads of persons dying deranged will be examined after death without showing diseased structure, or evident signs of increased vascular activity." The celebrated Morgagni gives similar results of his extensive dissections. Meckel and Jones are of the same opinion. However, Pinel, whose anatomical pursuits on the subject were most extensive, clearly declares that he never met with any other appearance