144 DIVISION OF LABOR 



4. How does nature make up for lack of protection of the eggs 

 of fishes ? (See Civic Biology, pages 238-239.) 



5. What is division of labor? 



6. What is a blastula? A gastrula? An embryo? Give 

 examples. 



7. What is a tissue ? An organ ? 



8. What are the functions necessary for all animals ? 



9. How are these functions performed in a single-celled animal? 

 In a many-celled animal ? 



10. What do we mean by evolutionary order? 



Hefbbencb Books 



Hunter, Civic Biology, Chap. XIV. American Book Company. 



Hunter, Elements of Biology, Chap. XVI. American Book Company. 



Hunter, Essentials of Biology, Chap. XVI. American Book Company. 



Adams, Guide to Study of Animal Ecology. The MacmiUan Company. 



Comstock, Manual for Study of Insects, Comstock Publishing Company. 



Comstock, The Spider Book. Doubleday, Page and Company. 



Davenport, Introduction to Zoology. The MacmiUan Company. 



Fabre, Life of the Fly. Dodd, Mead and Company. 



Fabre, Life of the Spider. Hodder and Stoughton. 



Fabre, Social Life in the Insect World. T. Fisher TJnwin. 



Flower, The Horse. D. Appleton and Company. 



French, The Butterflies of the Eaxtern United States. J. B. Lippincott Company. 



Hahn, Hibernation of Animals. Popular Science Monthly, February, 1914. 



Harmer and Shipley, The Cambridge Natural History. Vol. V. The MacmiUan 



Company. 

 Herrick, Household Insects and Methods of Control. CorneU Reading Courses. 

 Holland, The Butterfly Bock. Doubleday, Page and Company. 

 Holland, The Moth Book. Doubleday, Page and Company. 

 Hornaday, Our Vanishing Wild Life. New York Zoological Society. 

 Hornaday, American Natural History. Charles Scribner's Sons. 

 Hough and Sedgwick, The Human Mechanism. Ginn and Company. 

 Howard, The Insect Book. Doubleday, Page and Company. 

 Kellogg, Elementary Zoology. Henry Holt and Company. 

 Kingsley, The Comparative Anatomy of the Vertebrates. P. Blakiston's Son and 



Company. 

 LinviUe and KeUy, Textbook in General ZoSlogy. Ginn and Company. 

 Maeterlink, Life of the Bee. Dodd, Mead and Company. 

 Miall, Aquatic Insects. The MacmUlan Company. 

 MiUer, Butterfly and Moth Booh. Charles Scribner's Sons. 

 Miner, Animals of the Wharf Piles. American Museum of Natural History. 

 Miner, Sea Worm Group. American Museum of Natural History. 

 Needham, Elementary Lessons in ZoSlogy. American Book Company. 



