i S 8 



LECTURES ON IMMUNITY 



sodium iodide were completely agglutinated in 50, 90, and 

 1 20 minutes respectively; normal bacilli are not agglu- 

 tinated at all by these solutions. On the other hand, 

 sero-bacilli are less affected than normal bacilli by some 

 solutions, for instance 0.0033 n. silver nitrate or 0.005 n - 

 hydrochloric acid. After a time of 15, 50, and 1440 

 minutes these preparations gave the following results: 



These and other similar experiments indicate that the 

 agglutination requires time (cf. p. 116). Further, a certain 

 concentration (limit-value) of the salt-solution is necessary 

 to give an appreciable agglutination. The following table 

 gives the limit value in o.ooi n. of the concentration for 

 different salts. The sign co indicates that even the 

 strongest salt-solutions did not agglutinate. The quanti- 

 ties of salt necessary for the first trace of agglutination 

 have the greatest value for a-mastic, then come /3-mastic 

 and normal bacilli, and after them sero-bacilli, which are 

 the most sensitive to salts. The salts of alkalies, alkaline 

 earths, and magnesia exert little or no influence on common 

 bacteria. The agglutinating power is greater for salts of 

 trivalent metals than for those of divalent metals. A 

 very strong influence is exerted by the acids, especially 

 the strong ones. The anions seem to exert very little 

 influence. 



