CLASS-BOOK OF ZOOLOGY. 



91 



§371. What do you know of their abstinence from food: 



§37-2. On what do they feed? 



§ 373. What do you know with regard to their instinct ? 



§ 374. What is the size of their eggs ? 



§ 375. Of what use are Reptiles? 



1st Order. — Snakes. 



Fig. 21. 



The Rattlesnake. — (Crotalus horridm.) 



2d Order. — Lizards. 



Fi r '. 22 > 



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The Green Lizard. — 'Lacerta agilis.) 



