169 



On testing later, Me 2 gave a weak reaction, Me 3 and Me 4, 

 marked reactions. 



In the column on the left the strains tested are given; columns I, 

 II etc. give the results of each 1 series of tests. When not otherwise 

 stated, all the experiments in the same column were carried out 

 simultaneously. 



The test was performed with the usual technique of Bohme. 

 To 1 volume of broth culture is added 1/2 volume of the following 

 mixture, — paradimethyl-amido-benzaldehyde, 4 gm. ; 96o/o alcohol, 

 380;'* concentrated hydrochloric acid, 80.* After slight stirring 1/2 

 volume of a saturated solution of potassium persulphate is added 



Bohme does not stale whether grams or c.c. I have assumed 

 grams were meant, but I have since become aware that most 

 authors probably have taken the values to be c.c. 



