Chemical Basis of Genus and Species 59 



ter's quantitative method to this problem and confirmed 

 the results of Nuttall. A few examples may serve as 

 an illustration. 



TABLE III 

 TESTS WITH ANTI-DUCK'S-EGG SERUM 



Frog, Amphiuma, and Dogfish sera, as well as Tortoise and 

 Dogfish egg-albumins, were also tested, with negative results. 



TABLE IV 

 TESTS WITH ANTI-FOWL'S-EGG SERUM 



