ZOOLOGICAL DISTRIBUTION OF DISEASE. 277 



these animals. This, again, is another example of the 

 same cause producing varying effects in different species 

 of animals, of which we have had several instances in 

 this chapter, and I can only repeat that if this subject 

 were carefully and broadly investigated, many diseases 

 supposed to be distinct in man and the lower animals 

 would be found to depend upon the same cause. 



