Ill 



ON EMBRYOLOGY AS AN AID 

 TO ANATOMY 



THERE are perhaps few sciences, or branches of 

 science, in_wJiich progress has been so rapid and 

 whose importance has been so suddenly and un- 

 expectedly revealed as that of embryology. When 

 we consider the vast number of papers, memoirs, 

 and treatisS__that are continually being poured 

 forth it is^difficult to realise that embryology, as 

 we now understand it, practically commenced in 

 1837 with Ihe publication of von Baer's treatise on 

 the Development of Animals. The Study of 

 Invertebrate Embryology is still more recent, and in 

 its modern form is only about a dozen years old. 

 No one who compares our text-books of biological 

 science of the present day with those of twelve or 

 even six years ago can fail to be struck with 

 the great change effected by embryology in the 

 methods of teaching this science. 



At the outset men hardly knew what to do with 

 this new branch of science ; for its study the 



