BY H. G. CHAPMAN. 



541 



These results show that the amount of precipitate yielded by 

 each antiserum is a tixed quantity for each cubic centimetre of 

 antiserum. It must be noticed that the amount of saline solu- 



Table xi. 



tion used as a diluent is the same throughout the series. In 

 tubes 1 and 2, 2-5 c.c. antiserum for horse-serum interacted with 

 100 mg. dried horse-serum, and the duplicates agree well. In 

 tubes 3, -t, and 5, 2 c.c, 3 c.c, and 4 c.c. fowl's egg-white anti- 

 serum interacted with 100 mg. dried egg-white, yielding 8*6 mg., 

 12-5 mg., and 16*7 mg. precipitate respectively. Calcidating tlie 

 amount for each c.c antiserum, it is fouud to be about 4 '2 mg. in 

 each case. In tubes 6 and 7, 2-5 c.c. antiserum for hor.se-seram 

 reacted with 50 mg. horse-serum, and 5-0 c.c. antiserum reacted 

 with 200 mg. horse-serum. The amount of precipitate in the 

 second tube was exactly double that in the first tube. In tubes 

 8 and 9, 5 c.c and 10 c.c. antiserum each interacted with lOOmg. 

 dried egg-white, and the weights of the precipitates agree suffi- 

 ciently well. In tubes 10, 11, 12, and 13, 1 c.c, 2 c.c, 3 c.c, and 

 4 c.c. antiserum for fowl's egg-white each reacted with 28 mg. 



