74 University of California Publications in Zoology [ VOL - n 



The same experiment was carried out with Hyla tadpoles with 

 the same results (table 6). 



TABLE 6 



Length measurements of Hyla tadpoles fed on albumen and albumen plus 

 lecithin. Length measurements represent average length of all the 

 tadpoles in the dish. 



Hyla. Experiment started Feb. 21 

 Length in mm. 



Food Feb. 26 Mar. 5 Mar. 25 



Albumen 12.5 17.1 22.0 



Albumen + lecithin 12.3 16.9 25.6 



Mar. 5. Tadpoles fed on lecithin plus albumen are distinctly lighter than 

 the others. The tadpoles fed on albumen alone have slender, 

 pinched bodies, while the others are the normal shape and 

 size. 



Mar. 25. The color difference is scarcely noticeable. 



Apr. 10. Some tadpoles on lecithin plus albumen are as dark as those on 

 albumen alone, but most of them are lighter. 



Liver plus lecithin, and liver alone, were fed to two different 

 sets of Rana tadpoles with the following results (table 7) : 



TABLE 7 



Length measurements of Eana tadpoles fed on liver and liver plus lecithin. 

 Length measurements represent average length of all the tadpoles. 

 Eight tadpoles in each lot. 



Eana. Experiment started Feb. 6, 1912 

 Length in mm. 



Food Feb. 20 Feb. 26 Mar. 6 Mar. 14 



Liver 21.4 24.2 27.4 30.25 



Liver + lecithin 20.6 24.05 28.2 30.29 



Feb. 21. Tadpoles fed on liver alone are darker than the others. 

 Feb. 26. Tadpoles fed on liver alone are darker than the others. 

 Mar. 14. Some about the same color, others darker in dish containing 

 liver alone. 



The same experiments with Hyla gave the following results 

 (table 8) : 



