PROBLEM I. The Kinds of An'mials of the Earth ^y 



Fishes 



10. Study of a living fish. Examine a goldfish in a bowl of clear water. 

 Where are the paired fins; the unpaired fins? Examine and describe a 

 fin which is spread out. How are the scales arranged? Is this of any ad- 

 vantage to the fish? Try to catch the fish with your hand. What do you 

 notice? Describe the movement of the gill cover. What do you see under- 

 neath it when it is raised? 



1 1 . State at least four ways in which the structure of a goldfish makes 

 possible rapid movement through the water. 



12. Stir the water in the goldfish bowl to make the fish swim quickly. 

 What part of the fish pushes it forward? What part do the paired fins 

 play in locomotion? 



13. Organize a class trip to a fish market on a Thursday afternoon 

 after school. List the kinds of fish. Take notes on their sizes, colors, and 

 markings so that you can recognize them again. How much do they 

 cost per pound? Compare the price with that of lamb, chicken, beef, 

 and pork. Why can fish usually be sold more cheaply than meat? 



Further Activities in Biology 



Ma7fmtals 



1. Make plaster casts of the tracks of mammals. (See Mann and Has- 

 tings, and others.) If you can get dogs, cats, rabbits, and white mice, you 

 can take their footprints by wetting their feet with ink and leading them 

 across sheets of wrapping paper. 



2. Since the class Mammals is so large, you and your classmates might 

 organize committees to make a special study of the different orders. If 

 written reports are prepared, they could be organized into one large 

 account of the mammals. 



3. Breed white mice, guinea pigs, or rabbits, so that live mammals are 

 available for study. 



4. If you can, learn something about the habits of one of the follow- 

 ing: rabbit, woodchuck, chipmunk, squirrel, prairie dog, deer. If possible, 

 take "notes" with a camera. 



Birds 



5. If there is no Junior Audubon Society in your school, ask the class 

 secretary to write to the National Association of Audubon Societies, 1000 

 Fifth Avenue, New York City, for further information. 



6. Are you a Scout? Have you earned the Bird Study Merit Badge? 



7. Even if you live in a city, it will be easy for you to keep and breed 

 pigeons on the roof. 



8. Write to the Geological Survey, Washington, D.C., about bird- 

 banding. Read the National Geographic Magazine, January, 1928. Report 

 to the class on the subject. 



