Biologists Study Ani?nals and Plants 



Fig. 3 The Central Asiatic 

 expedition of the American 

 Museii/u of Natural History 

 jueets with an accident in 

 the Mongolian Desert. What 

 abilities iiiiist the explorer 

 have besides a knowledge of 



biology? (AMERICAN MU- 

 SEUM OF NATURAL HISTORY) 







'VM^*.*?V,**"^i« 



Fig. 4 Exploring in a jtmgle. 

 Dr. Williaju Beebe and two 

 fellow scientists take motion 

 pictures of living things oji 

 the floor of a jungle in 

 Venezuela, (jocelyn crane 



—NEW YORK ZOOLOGICAL SO- 

 CIETY) 



pencil, you will be able to take notes 

 as soon as your eyes grow accustomed 

 to the dim light. 



The sunlight filters through this clear 

 tropical water and flashes from the bril- 

 liant reds and yellows of the many kinds 

 of fish. The beauty of the ocean floor 

 with its brightly colored animals will 

 delight y<JU as it has the biologists who 

 have gone down many times to study 

 this active world of living things. Some 

 have described its beauties, others have 

 painted its scenes, and still others have 



photographed the graceful forms so that 

 everyone may now enjoy the gardens 

 undersea. When the ^\'ater is clear and 

 not too deep, living things in the sea 

 can be seen through panes of glass in 

 the bottom of a boat. Diving in a helmet 

 has many advantages, however. And 

 now that helmets have been perfected 

 almost anyone can explore the shallow 

 seas. But for exploration down to a 

 depth of half a mile a bathysphere is 

 used. This is a ball of steel with thick 

 glass windows and a powerful electric 



