66 



EXPERIMENTAL DAIRY BACTERIOLOGY 



be qualified by the addition of a fermentable sugar, the or- 

 ganisms find much more favorable conditions for growth. 



Primary tests for identification of species. The primary 

 tests for the identification of bacterial species are those that 

 can be answered positively or negatively. In the study of an 

 organism the following scheme should be employed : The posi- 

 tive results should be expressed by a cross (+), a double cross 

 ($) indicating an emphatically positive result ; zero (0) indi- 

 cates a negative result ; a question mark (?), a doubtful result ; 

 and a blank space indicates that no determination was made. 



1. Source 



2. Number or name 



PRIMARY TESTS FOR IDENTIFICATION 

 BACTERIAL SPECIES 



OF 



