OF EVOLUTION. 39 



bring them forth within the egg, and that the early 

 development of the egg corresponds with the 

 development of the egg of the reptile. This is 

 one of the most extraordinary discoveries made 

 in zoology during the last decade, and so 

 remarkable is it, that when a similar announce- 

 ment was made some sixty years ago, and by 



Spiny hedgehog (Echidna). 



one of the most eminent of naturalists living at 

 the time, it met with absolute unbelief. 



The evidence bearing upon the inter-relationship 

 of mammals and reptiles is rapidly accumulating, 

 and it will probably not be long ere we will 

 be able to point to the connecting form between 



