Introduction xi 



classification of which is followed in this guide, and should 

 have for reference as many other books on the subject as 

 possible. Among the more important of these, mention 

 may be made of the following: — 



Thomson's " Study of Animal Life." 

 "The Riverside Natural History." 

 "The Cambridge Natural History." 

 Claus's " Text-book of Zoology." 

 Lang's "Text-book of Comparative Anatomy." 

 McMurrich's " Invertebrate Morphology." 

 Packard's " Text-book of Entomology." 

 Comstock's " Manual for the Study of Insects." 

 Parker's " Elementary Biology." 

 Hertwig's " General Principles of Zoology." 

 Jordan and Kellogg's " Animal Life." 

 Jordan and Heath's " Animal Forms." 



It is very desirable that some book should be studied 

 by the class as a text-book to supplement the knowledge 

 obtained through the laboratory study. 



THE CULTIVATION AND PREPARATION OF MATERIAL 



Perhaps the greatest difficulty that confronts the inexpe- 

 rienced teacher of zoology is found in obtaining the mate- 

 rial to be studied, in sufficient quantity and in good 

 condition for class use. Success with the laboratory 

 method of instruction in biological subjects renders it im- 

 perative that the organism selected should be on hand in 

 the right conditions and at the right time. To accomplish 

 this, however, is no light task. The subjects are to be 

 taken up in a certain definite order and at certain definite 

 times, and the specimens studied, to be of the most value, 



