THE OVARIAN EGG. 295 



intellectual conception which spans the whole 

 series of geological ages, and is perfectly consist- 

 ent in all its parts. In this sense the present 

 will indeed explain the past, and the young 

 naturalist is happy who enters upon his life of 

 investigation now, when the problems that were 

 dark to all his predecessors have received new 

 light from the sciences of Paleontology and 

 Embryology. 



