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 



Material tested 



Duck's 



Pheasant's 



Fowl's 



Silver Pheasant's 



Blackbird's 



Crane's 



Moorhen's 



Thrush's 



Emu's 



Hedge-Sparrow's 



Chaffinch's 



Tortoise serum 



Turtle serum 



Alligator serum 



egg-albumin. 



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 



