PROPERTIES OF COMPLEMENTOIDS 

 2. 0-05 c.c. anti-S in each tube. 



In this case of course, as already explained, the surplus 

 C comes off much more gradually, and a more accurate result 

 might be expected. The theoretical consideration of all 

 the factors, however, is one of much complexity, and we do 

 not claim to explain it fully. The following points are to 

 be noted, however : (1) The amount of C obtainable has 

 been estimated by the amount of lysis the two, however, 

 only approximately correspond it is not possible to detect 

 the smallest amount of C, we can only note the first appre- 

 ciable lysis ; (2) as has been stated, the combining value of C 

 (fresh serum) usually falls somewhat when converted into 

 Cd (unfortunately a separate estimation of the exact 

 value of Cd in the experiments before us was not made) ; 

 (3) when there is a surplus of C and Cd molecules the former 

 are taken up by the intact corpuscles treated with IB, the 

 latter very slightly ; the balance of dissociation may thus 

 be affected. 



Looking, however, at the results in a general way, we see 

 that C is kept out of combination by Cd, that the points at 

 which surplus C is obtained are not far distant from each 

 other in the two series, and that the interval from the point 

 at which C is first obtainable to that at which a full dose is 



