NOTICES OF BOOKS. 9L 



of the book is arranged under group headings, such as Desmids^ 

 Diatoms, Infusoria, Rotifera, etc., each group being provided 

 with analytical tables. Only the most conspicuous external 

 characters are made use of in these tables, with little regard to 

 scientific classification, and with regard to but one result only — 

 to help the tyro to find the name, at least the generic name, of 

 his specimens. These tables seem a very useful feature of the 

 book, and will doubtless prove helpful to the beginner in working- 

 out the commoner objects and those most frequently met with», 

 which are all that can be included in a work of this character. 



