XX CONTENTS. 



Pagu 



Method of obtaining infusoria - 3b7 



Method of obtaining and of keeping hydras - 389 



Desmidieae - • - 391 



Localities for infusoria 393 



The locality of the wheel animalcule 394 



Method of feeding infusoria with carmine - 395 



Fossil infusoria - 396 



Method of preparing fossil infusoria - 397 



CHAPTER XVIII. 



