LIST OF ILLTJSTEATIOlSrS. 



-*o^ 



PLATES. 



Development of a Calcareotis Sponge (Olynthus) ... 



I. — Life History of a Simplest Organism ... 



II., III. — Germs or Embryos of Four Vertebrates ... 



TAGS 



... Frontispiece 



To face page 184 



„ 306 



FIGUEES. 

 1. — Propagation of Moneron ... 

 2. — Propagation of Amoeba ... 

 3. — Egg of Mammal ... 

 4. — First Development of Mammal's Egg 

 5. — The Hmnan Egg Enlarged 

 6. — Development of Mammal's Egg 

 7. — Embryo of a Mammal or Bird ... 



