VI 



Standard Serum. Serum from the 



'l' lll)e Tube an/ an I !/ 3/ 5; 7; 9; n/ 15/ is/ 2l/ 



No. No. '3 /a / 4 ' 4 / 4 14 / 4 ,'4 / 4 / 4 / 



1) 0,1 1) 0,02 - 



2) 0,08 2) 0,017 - 



3) 0,0(5 3) 0,013 



I^-fc 



4) 0,05 = * 4) 0.01 - 



5) 0,04 = . (? 5) 0,008 

 (5) 0,035 6) 0,000 

 7) 0,03 7) (),( 



8) 0,025 8) 0,004 - *- 



Sti 0,02 9) 0,0035 - J 1 - 



10) 0,017 10) 0,003 - 



11)0 (control) 11) 0,0025 - 



12) 0,002 



13) 0,0017 - 



14) 0,0013 - 



15) 0,001 



For testing the standard serum 10 tubes were used, 

 to which was added from 0,1 cc. to 0,017 cc. serum. 

 For the testing of each of the other sera 15 tubes were 

 used containing from 0,02 to 0,001 cc. Having been 

 kept in the incubator for l ] / 2 hour at the same lime 

 all the series were taken out, and lube no. 5 of the 

 standard serum series (containing 0,04 cc.) was used 

 for the testing (in the table indicated c?j. Its degree of 

 clarification was found lying between that of no. 5 and 

 no. 6 of the serum 39 / 3 . near up to no. 6, and it was 

 judged to correspond almost to the action of 0,0065 cc. 

 The serum 3 % was exactly like a9 / 3 , but the Y 4 was 

 stronger, as 0,005 cc. of this corresponded to 0,04 cc. 

 of the standard serum etc. Afterwards tube no. 4 of 

 the standard serum (0,05 cc.) was used for the testing 

 (*), and the corresponding degree of agglutination deter- 

 mined for all the samples. 



7 



