Galen’s medicinal simples include the bile of bulls, hyenas, cocks, partridges, and other animals.[771] A digestive oil can be manufactured by cooking foxes and hyenas, some alive and some dead, whole in oil.[772] Galen discusses with perfect seriousness the relative strength of various animal fats, those of the goose, hen, hyena, goat, pig, and so forth.[773] He decides that lion’s fat is by far the most potent, with that of the pard next. Among his simples are also found the slough of a snake, a sheepskin, the lichens of horses, a spider’s web,[774] and burnt young swallows, for whose introduction into medicine he gives Asclepiades credit.[775] Of Archigenes’ prescriptions for toothache he repeats that which recommended holding for some time in the mouth a frog boiled in water and vinegar, or a dog’s tooth, burnt, pulverized, and boiled in vinegar.[776] Cavities may be filled with toasted earthworms or spiders’ eggs diluted with unguent of nard. Teething infants are benefited, if their gums are moistened with dog’s milk or anointed with hare’s brains.[777] For colic he recommends dried cicadas with three, five, or seven grains of pepper.[778]
Some scepticism.
Galen is less confident as to the efficacy for earache of the multipedes which roll themselves up into a ball, and which, cooked in oil, are employed especially by rural doctors.[779] He is still more sceptical whether the liver of a mad dog will cure its bite.[780] Many say so, and he knows of some who have tried it and survived, but they took other remedies too.[781] Galen has heard that some who trusted to it alone died. In one treatise[782] Galen discusses the strange virtues of the basilisk in much the usual way, but in his work on simples[783] he remarks drily that it is obviously impossible to employ it in pharmacy, since, if the tales about it be true, men cannot see it and live or even approach it without danger. He therefore will not include it or elephants or Nile horses (hippopotamuses?) or any other animals of which he has had no personal experience.
Doctrine of occult virtue.
Galen tries to find some satisfactory explanation of the strange properties which he believes exist in so many things. The attractive power of the magnet and of drugs suggests to him that nature in us is divine, as Homer says, and leads like to like and thus shows its divine virtues.[784] Galen rejects Epicurus’s explanation of the magnet’s attractive power.[785] It was that the atoms flowing off from both the magnet and iron fit one another so closely that the two substances are drawn together. Galen objects that this does not explain how a whole series of rings can be suspended in a row from a magnet. Galen’s teacher Pelops, who claimed to be able to tell the cause of everything, explained why ashes of river crabs are used for the bite of a mad dog as follows.[786] The crab is efficacious against hydrophobia because it is an aquatic animal. River crabs are better for this purpose than salt water crabs because salt dries up moisture. He also thought the ashes of crabs very potent in absorbing the venom. But this type of reasoning is unsatisfactory to Galen, who finds the best explanation of all such action in the peculiar property, or occult virtue, of the substance as a whole. Upon this subject[787] he proposes to write a separate treatise, and in the fragment De substantia facultatum naturalium (περὶ οὐσίας τῶν φυσικῶν δυνάμεων) he again discusses the matter.[788]
Virtue of the flesh of vipers.
Among parts of animals Galen regarded the flesh of vipers as especially medicinal, particularly as an antidote to poisons. Of the following cures wrought by vipers’ flesh which Galen narrates[789] two were repeated without giving him credit by Aëtius of Amida in the sixth, and Bartholomew of England in the thirteenth century, and doubtless by other writers. When Galen was a youth in Asia, some reapers found a dead viper in their jug of wine and so were afraid to drink any of it. Instead they gave it to a man near by who suffered from the terrible skin disease elephantiasis and whom they thought it would be a mercy to put quietly out of his misery. He drank the wine but instead of dying recovered from his disease. A similarly unexpected cure was effected when a slave wife in Mysia tried to kill her husband by offering him a like drink. A third case was that of a patient whom Galen told of these two previous cures. After resorting to augury to learn if he too should try it and receiving a favorable response, the patient drank wine infected by venom with the result that his elephantiasis changed into leprosy, which Galen cured a little later with the usual drugs. A fourth man, while hunting vipers, was stung by one. Galen bled him, extracted black bile with a drug, and then made him eat the vipers which he had caught and which were prepared in oil like eels. A fifth man, warned by a dream, came from Thrace to Pergamum. Another dream instructed him both to drink, and to anoint himself with, a concoction of vipers. This changed his disease into leprosy which in its turn was cured by drugs which the god prescribed.
Theriac.
The flesh of vipers was an important ingredient in the famous antidote and remedy called theriac, concerning which Galen wrote two special treatises[790] besides discussing it in his works on simples and antidotes. Mithridates, like King Attalus in Galen’s native land, had tested the effects of various drugs upon condemned criminals, and had thus discovered antidotes against spiders, scorpions, sea-hares, aconite, and other poisons. He then combined the results of his research into one grand compound which should be an antidote against any and every poison. But he did not include the flesh of the viper, which was added with some other changes by Andromachus, chief physician to Nero.[791] The divine Marcus Aurelius used to take a dose of theriac daily and it had since come into general use.[792] Galen gives a long list of ills which it will cure, including the plague and hydrophobia,[793] and adds that it is beneficial in keeping a man in good health.[794] He advises its use when traveling or in wintry weather, and tells Piso that it will prolong his life.[795] He explains more than once[796] how to prepare the viper’s flesh, why the head and tail must be cut off, how it is cleaned and boiled until the flesh falls from the backbone, how it is mixed with pounded bread into pills, how the flesh of the viper is best in early summer. Galen also accepts the legend,[797] quoting six lines of verse from Nicander to that effect, that the viper conceives in the mouth and then bites off the male’s head, and that the young viper avenges its father’s death by gnawing its way out of its mother’s vitals. The Marsi at Rome denied the existence of the dipsas or snake whose bite causes one to die of thirst, but Galen is not quite sure whether to agree with them.
Magical compounds.