VETERINARY ZOOLOGY. 337 



observers, that this bronchial affection of American sheep was 

 due in many instances to the presence of this living worm, 

 the same as in the old country, where it has produced such 

 serious losses for many years. It was probably first observed 

 in this country by Prof, Jeffries Wyman of Cambridge, as 

 early as 1840. And it has been frequently seen by President 

 Bustead, of the N. Y. Veterinary College, in specimens of 

 sheep's lungs sent him for examination. But no one was 

 aware of its extensive prevalence until last winter, when the 

 subject was brought to light in the flock belonging to H. L. 

 Stew^art, of Middle Haddam, Connecticut ; for Prof. James 

 Law, of Cornell University, who was familiar with this disease 

 in Europe, says, in 1871, that he has been able to find no 

 proof of its existence among our sheep. 



Hence, can we teach a more important branch in our agri- 

 cultural schools than that of veterinary zoology in all its rela- 

 tions, which will thus include, not only the beasts of burden 

 and the food-animals, but their accompanying parasites? I 

 have therefore dwelt on this subject, in order to call your 

 attention to the merit which it deserves, and will receive in 

 our hands, w^th your permission and assistance. 



In our course of investigations, we shall find excellent 

 opportunity for the study of philosophical anatoni}^ as an 

 element of discipline ; and thus we shall be led, from the 

 pure love of science, to inquire into the comparative rela 

 tions of man with the lower orders of animals. Not that 

 we expect to find the connecting link, which many have 

 imagined, but to see the variations of that plan of structure 

 which thus connects all vertebrate animals. And we shall 

 find, upon careful investigation, that all these creatures can 

 be reduced, morphologically, to a series of transverse seg- 

 ments.' Having thus studied the anatomical elements of one 

 of these vertebral segments in detail, we readily comprehend 

 a multiple of each and every animal of this type of organiza- 

 tion, with man included. 



Again, the human hand, which presents so many points 

 of utility and admiration for the speculations of the philos- 

 opher, can be better understood by studying the modified 

 expressions of the same in our domesticated animals. The 

 hog presents the same number of bones in one of the forward 



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