2IO 



LECTURES ON IMMUNITY 



The last figure indicates that the quantity of free poison 

 exceeds the calculated one, under the assumption that 

 K= o, and that hence K has a finite value. If we calculate 

 K from this, placing I c.c. of antivenin as equivalent to 

 1.86 c.c. of the lysin, we find K 0.0006, using the same 

 equation as for tetanolysin. In the experiments with 

 cobralysin to each 1000 c.c. of horse-blood suspension were 

 added 8 c.c. of o.oi n. lecithin. 1 



NEUTRALISATION OF ic.c. OFO.I PER CENT COBRALYSIN BY MEANS 

 OF wc.c. OF ANTIVENIN (i PER CENT HORSE BLOOD) 



Here i c.c. of the antivenin-solution is equivalent 

 to 1.68 c.c. of the poison. The last observation gives 

 ^=0.0016. 



1 Cf. Kyes : Berl. klin. Wochenschrift, No. 19 (1904). Kyes finds the 

 following values for cobralysin : 



Even here we find a deviation from the calculated value in the direction 

 that a mixture which was calculated to be neutral showed haemolytic proper- 

 ties. 



