THE LIZARD 77 



them from the pond and put them in the pan. This material 

 will furnish food for the young tadpoles. New food should 

 be added from time to time. Do not attempt to rear too 

 many in one pan, and do not set the pan in strong sunlight. 

 Arrange other pans and experiment with them by setting 

 them in light of varying intensity and in temperatures of 

 different degrees. 



Note the shape and color of the eggs. Note when the 

 eggs hatch. Note the appearance of the very young tad- 

 poles. Do they possess feet? How do they swim? Do 

 they ever fasten themselves to objects in the water ? What 

 color are they? Observe them from day to day and note 

 all the changes that take place in them as they grow. 

 How do the young tadpoles breathe? Find the gills. 

 Where are they? Determine, if possible, when the gills 

 disappear. Note that the young tadpole, as it grows older, 

 begins to come to the surface now and then to get air. 

 The tadpole is now beginning to use its lungs. Note the 

 first appearance of the legs. Which pair appears first? 

 Observe the tail from day to day. Note that it grows 

 smaller and smaller. It is actually absorbed into the body. 

 Note when the second pair of legs appear. Note the time 

 that it takes a young tadpole to become mature. 



It would be well to make careful notes and even drawings 

 from time to time. 



In the same manner the life history of the toad may be 

 easily followed. 



XXII. THE LIZARD 



Materials. Specimens of lizards, wooden box, earth, leaves, 

 wire netting, dissecting instruments, board, tacks, inflating appara- 

 tus (see Appendix). 



