THE OPSONIC EXPERIMENT 



503 



For f ra = b - cm 



c 



b / b \ /b \(e T 



y- = yo T (- 1 -)•••• (T- m + I j — 



Mean = *T" (1 - e ~ ^~ * J 



c r 



(Standard deviation) 3 = e b x mean. 



i)' 



m! 



The figures in Table III. show the result of a calculation 



Table III. 



on the basis of increased appetite. Table II. gives in the 

 columns headed "Mean" and "z" a comparison between ob- 

 served means and z, and in the last column I have added values 



of -r calculated roughly from the equation : 



(Standard deviation) 8 «* e b x mean. 



An exceedingly interesting result is obtained. 



It will be observed that in the case of one worker, Dr. Flem- 

 ing, the first three values lie between 003 and 0*06, and that the 

 last three vary between 0*12 and 0-145. In Dr. Greenwood's 

 experiment the figure rises to 0-196, in spite of the magnitude 

 of the experiment ; whilst Dr. Strangeways' experiments show 

 values varying from 0-247 to 0*295 (i.e. twice as great as Fleming's 

 latter figures, and six times as great as his first three). The 

 consistency of the figures obtained by the different workers 



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