18 Dairy Bacteriology. 



essential as the determination of culture characteristics; 

 in fact, the two must go hand in hand. The examination 

 reveals not only the form and si::e of the individual germs, 

 but the manner in which they are unite 1 with each other, 

 as well as any peculiarities of movement that they may 

 possess. 



In carrying out the microscopical part of the work, not 

 only is the organism examined in a living condition, but 

 preparations are made by using solutions of auilin dyes as 

 staining agents. These are of great service in bringing 

 out almost imperceptible differences. The art of staining 

 has been carried to the highest degree of perfection in 

 bacteriology, especially in the detection of germs that are 

 found in diseased tissues in the animal or human body. 



In studying the peculiarities of any special organism, 

 not only is it necessary that these cultural and micro- 

 scopical characters should be closely observed, but special 

 experiments must ba carried out along different lines, in 

 order to determine any special properties that the germ 

 may possess. Thus, the ability of any form to act as a 

 fermentative organism can be tested by fermentation ex- 

 periments; the property of causing disease, studied by the 

 inoculation of pure cultures into animals. A great many 

 different methods have been devised for the purpose of 

 studying special characteristics of different bacteria, but a 

 full description of these would necessarily be so lengthy 

 that in a work of this character they must be omitted. 

 For details of this nature consult standard reference books 

 on bacteriological technique. 



