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XATUEE-STUDY REVIEW 



[6:6-Sept.,1910 



will not need to use any special methods to attract and hold their 

 attention. Young people are investigators by nature. Under 

 the rule of their teachers they gradually get overmastered by 

 the influence of authority, until when they get to the univer- 

 sity and take courses in science, it takes perhaps two years to 

 get them to use their own eyes again, and only a few students 

 ever attain a condition of real mental self-reliance. Young peo- 

 ple are full of curiosity, to be sure, but they are too hasty in their 

 observations and conclusions. So the teacher must direct their 

 mental processes, to the end that their obervations may be ac- 

 curate and thorough, and their inferences correct. 



In the short time allowed to zoology in the high school, 

 the largest results can be had only by a careful selection of a 

 few subjects for study. For elementary work on insects this 

 list of subjects is a good one: grasshopper, squash bug, potato 

 beetle, cabbage butterfly, meat fly, honey bee. Each of these 



FIG. 2. J.ARVA AND 



PUPA OF CABBAGE 



BUTTERFLY 



3. FEMALK (TOP) AND MALE (bot- 

 tom) CABBAGE BUTTERFLY 



should be collected in all its stages if possible. These types give 

 a good idea of the anatomy and transformation of insects, are 

 good illustrations of the principal orders of insects, and are spec- 

 ies of economic importance. Squash bugs (Fig. i) in several 

 stages, are as a rule, easy to obtain in autumn on cucurbitaceous 

 plants. The Colorado potato beetle is a convenient form to use, 

 but the larvae and pupae must be obtained beforehand, in sum- 



