197 



Zbc Storv> of JBir()-2)eatb. 



By W. Geo. Cresweli., M.D. Durli., L.R.C.P., F.Z.S. 

 (Continued from page i6oJ. 



^ #rO TXL students in certain departments of biology 

 Jh| are aware that the anatomy and histology 

 f-^ of birds is very different from that of those 

 ^ animals which are further advanced along the 



scale of evolution, and that this difference is found to 

 be especially accentuated when we come to the con- 

 sideration of human characteristics. We can therefore 

 expect to find a very distinct influence exercised by 

 this condition upon the pathology and course of 

 disease in birds. This we do find, for there are patho- 

 logical processes — very common in birds — which are 

 unknown to exist in the highest forms of animal life. 

 Especially in the disease now under notice shall we 

 see an important modification in the effects produced 

 by septic bacilli on the more lowly organized tissues 

 of birds as compared with what happens in the case of 

 the generally more highly specialized tissues of the 

 human subject — a modification b}' the way which has 

 been responsible for one of the most remarkable errors 

 in the history of medicine. 



The principal, and perhaps the only channels, by 



