62 / BACTERIOLOGY 



To summarize briefly the foregoing it may be said, in 

 general, that for the growth and development of bacteria 

 nitrogenous organic matter of a neutral or slightly alkaline 

 reaction, in the presence of moisture and at a suitable tem- 

 perature, is all that is necessary. From this can be formed 

 some idea of the omnipresence in nature of these minute 

 vegetables. Bacteria are found wherever these conditions 

 obtain. 



