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Updated: June 16, 2025
During all this time he was in correspondence with savants from all over the world, and it is said of him that he never left a letter of any kind unanswered. Haller's greatest contribution to medical science was his famous doctrine of irritability, which has given him the name of "father of modern nervous physiology," just as Harvey is called "the father of the modern physiology of the blood."
It is hardly without a smile that we resuscitate the old question of the 'vis insita' of the muscular fibre, so famous in the discussions of Haller and his contemporaries. Speaking generally, I think we may say that Haller's doctrine is the one now commonly received; namely, that the muscles contract in virtue of their own inherent endowments.
His conclusion that this irritability exists in muscular substance alone and is quite independent of the nerves proceeding to it aroused a controversy that was never definitely settled until late in the nineteenth century, when Haller's theory was found to be entirely correct.
Numerous hairs, similar to those of its skin, are perpetually found among the contents of the stomach in new-born calves; which must therefore have licked themselves before their nativity. Blasii Anatom. See Sect. XVI. 2. on Instinct. The chick in the egg is seen gently to move in its surrounding fluid, and to open and shut its mouth alternately. The same has been observed in puppies. Haller's El.
A more complete list, with the titles of the books, may be found in Haller's "Bibliotheca Anatomica." Another of the distinguished Arabian physicians was Avenzoar the transformation of his Arabic family name, Ibn-Zohr. He was probably born in Penaflor, not far from Seville. He died in Seville in 1162 at the age, it is said, of ninety-two years.
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