538 



W. W. SWINGLE 



both animals the center of the glands are filled with growing 

 oocj^tes, while at the periphery are cells in synaptene stages. 



Another feeding experiment of a somewhat different nature 

 from the preceding, was tried upon Rana catesbiana larvae. 

 The]: larvae, measuring 75 mm. in length, with hind limb buds 3 



Fig. 9 Alimentary tract of control for animal shown in figure 8. Length 



of gut 346 mm. 

 sat 



mm. long and normal in every way, were starved from Novem- 

 ber 1, 1915 until April 8, 1916 — a period of over five months. 

 Nothing was fed these animals during this time. At the end of 

 the period of inanition, the tadpoles averaged 72.5 mm. in length. 

 The reduction in length was due to the resorption of the tail. 

 The larvae were greatly emaciated; the intestines had shriveled; 

 the skin over the back appeared corrugated and wrinkled, as 

 though the musculature beneath had been absorbed. The 



