144 



Mr. C. Russ. An Improved [Feb. 21, 



The results are shown in Table C, and show a still higher level of accuracy 

 than those of Table B, though visual matching of the emulsions (to produce 

 an average phagocytosis of three bacteria per leucocyte) was not very 

 successful, though it can be assured in future by a preliminary count. 



Table C. — Opsonic Index. (New Method.) 



Eepeated estimation of opsonin in normal serum to the Staphylococcus 

 aureus, using leucocytes only, and the opsonic mill, and counting 

 100 leucocyte contents. 



Series. 



50 leuco- 

 cytes, 



50 leuco- 



Opsonic 

 count. 



Mean 

 value. 



Error from mean 



Blanks, 

 per 100 



cytes. 



Maximum devia- 

 tion from 

 mean value. 



Film I. 



Film II. 



+ 









1 



© 



144, 

 127 

 107 

 131 



105 

 144 

 146 

 119 



249 

 271 

 253 

 250 



H 



Per cent. 

 6 



Per cent. 

 2 



1 



2 



18 

 18 

 16 

 20 



Per cent. 



6 



Percent. 



2 



2 



© 



142 

 170 

 150 

 176 



178 

 159 

 160 

 162 



320 

 329 

 310 

 338 



M 



1 



4 



1 



3 



10 

 15 

 16 

 8 



4 



1 



3 



© 



127 

 128 

 144 

 144 



120 

 103 

 113 

 132 



247 

 231 

 257 

 276 



| 252 | 





2 

 8 



49 

 40 

 32 

 40 



9 



8 



4 



© 



99 

 114 

 121 



96 



112 

 144 

 109 

 125 



211 



258 

 230 

 221 



| 230 | 



- 



8 

 3 



25 

 19 

 23 



25 



12 



8 











34 



30 































Average error a 

 "Worst error ale 



Dove or below the n 





= 64/16 



= 12 P , 







"Worst error below = 8 „ 



There was defective emulsification of the staphylococci in Series 3, evident 

 in the " clumpy " films, but fortunately the entire results of the table can 

 afford the handicap. 



All the films of Tables B and C have been preserved. 



