viii CIVIC BIOLOGY 



CHAPTER PAGE 



XXIII. CONTROL OF BACTERIAL DISEASES . . ." . . . 231 



XXIV. CONTROL OF ANIMAL PARASITES 253 



XXV. Civic PROBLEMS RELATING TO MOLLUSKS .... 271 



XXVI. CRUSTACEA .285 



XXVII. PROBLEMS OF FISH AND FISHING . . . . . . . 295 



XXVIII. AMPHIBIA : SIRENS, PROTEANS, SALAMANDERS, FROGS, 



TREE FROGS, AND TOADS 313 



XXIX. REPTILES : CROCODILES, ALLIGATORS, TURTLES, TER- 

 RAPINS, TORTOISES, LIZARDS, SNAKES 321 



XXX. PRACTICAL LAWS OF LIFE 330 



XXXI. KNOWING How TO KNOW How 346 



XXXII. PROGRESS IN DISCOVERY 355 



INDEX 363 



