BY II. G. CHAPMAX. 



543 



Tlie effect of tlie degree of dilution on the weight of precipitate 

 may be now considered. Two series of experiments were carried 

 out. In the first series the quantity of egg-white was constant, 



10 20 30 40 50 60 70 80 90 100 110 120 130 140 

 Weight of homologous protein in milligrams. 1 div. = 10 mg. 



Curve of weight of precipitate formed with increasiiig weiglits of 

 homologous protein : 3 cc; antiserum interact with ascending weights of 

 dried egg-white. 



and the amount of saline solution used to dilute the interacting 

 masses was varied. In the second series the quantity of egg- 

 white was maintained at a constant concentration in the saline 

 solution. The antisera employed were two fowl's egg-white 

 antisera prepared from rabbits. The results are recorded in 

 Table xiii. 



