BACTERIOLOGICAL APPARATUS 



61 



tubes, pipettes, centrifuges, shaking apparatus, apparatus for 

 heating the cultures to a definite temperature and other 

 devices have been placed on the market. As already men- 

 tioned, it is important to understand that various uses of 



Fig. 28. Incubator. 



the different apparatus, and to appreciate the fact that most 

 of it has been designed for special purposes and the other for 

 convenience. In selecting equipment for bacteriological 

 work, difficulties will be minimized if as simple and non- 

 complicated appliances as possible are chosen. In the appli- 

 cation of bacteriological knowledge in the practice of veter- 

 inary medicine, as in other fields, it is the principle that must 

 be applied and for this, special apparatus is not always neces- 



