394 



INFLUENCE OF THE DILUTION OF SERUM, 



A similar experiment was made at a later date, when the 

 necessity of using dilutions of serum stronger than one-half had 

 been shown. The tests were incubated for 10 minutes. 



Fig. 6. — Saline of various strengths. 



It will be noted from these results that the strength .of saline 

 employed has a pronounced efifect upon the nature of the dilution 

 curves. Further examples will be seen in the curves which 



follow 



