Ill 



Should the volume added be only one lenth, then 

 0,1 x is substituted for x in the numerator, the x in 

 the denumerator remains unchanged. 



Besides x obs. is a column x calc., calculated in the 

 manner indicated below. In the next column under the 

 heading G obs. is indicated the G, calculated from the 

 x obs. as above mentioned. The last column, G calc., 

 gives a theoretical value, calculated after a formula in- 

 dicated below. From this G calc. a x calc. has been 

 found according to the above formula for the purpose 

 of a direct comparison with the observed value of x. 



The toxicity of mixtures of tetanolysin and antitetanolysin. 



These observations are graphically reproduced in 

 fig. 4, where the line represents x calc. and the dotted 

 line G calc. The observed values are indicated by 

 means of this cross (X) or this (+) cross. 



It appears that the values of x obs. increase con- 

 tinuously and gradually with n. In consequence the 



58 - 



