570 MAN CONTROLS HIS ENVIRONMENT FOR WEALTH 



II. Animal foods (5) come mostly from bivalves ; (6) are obtained 

 from animals in every phyla of the animal kingdom; (7) come only 

 from mammals ; (8) depend in the long run upon the sun. 



III. Animal products are : (9) rayon, flax, cocaine, cottonseed oil, 

 and lumber; (10) pearls, sponges, piano keys, and tallow; (11) knife 

 handles, pen holders, buttons, and glue ; (12) silk, felt, and shoes. 



IV. Examples of animals that are indirectly useful are : (13) snakes ; 

 (14) sheep; (15) toads; (16) chickens; (17) house wren. 



V. Examples of harmful animals are: (18) starfish; (19) trout; 

 (20) the cobra of India; (21) parasitic worms; (22) screech owl. 



VI. Birds should be protected because (23) they feed on fruit and 

 grain; (24) they eat weed seeds; (25) they eat injurious insects; 

 (26) they furnish us with much meat. 



VII. Birds (27) that eat weed seeds are useful; (28) eat fruit only 

 when seeds are scarce ; (29) usually go southward as soon as their young 

 are old enough to fly; (30) always migrate; (31) usually destroy 

 more fruit than insects. 



VIII. Insects (32) can only be destroyed by other insects ; (33) such 

 as the ladybird beetle and honeybee are destructive to home gardens ; 

 (34) such as the aphids and gypsy moths destroy the early-ripening 

 fruits ; (35) destroy stored grains. 



IX. Insects are controlled (36) by birds; (37) by contact and 

 stomach poisons ; (38) by rats and mice ; (39) by picking and burning ; 

 (40) by their breeding places, destroying their eggs and their young. 



Achievement Test 



1. What are the cheapest and most nutritious roots, stems, and 

 leaves as food? 



2. What cereal crops are of the most importance in your locality? 



3. What is your most valuable local fruit crop? 



4. Which of your local industries are dependent, directly or in- 

 directly, upon plants ? 



5. What fish ai;e the cheapest in local markets arid why? 



6. What " shell fish " are locally obtained and what are they 

 used for? 



7. Have you ever kept bees? How much honey do they produce 

 to a hive? 



