PART I. 



THE MORPHOLOGY AND CULTURE OF MICRO- 

 ORGANISMS. 



GENERAL.* 



Microbiology includes some algcc, a few specific molds, which fall in the 

 realm of pathogenesis (disease production), zymogenesis (fermentation- 

 production), and laboratory manipulations; it deals mainly with yeasts, 

 bacteria, and invisible organisms; it dips deeply into the expanse of pro- 

 tozoa; in short, it is concerned almost wholly with the field of unicellular 

 life. On the one hand, the microbiologist meets the botanist and estab- 

 lishes reciprocal relations with him; on the other hand, he mixes with the 

 zoologist and delves into studies of mutual interest. Primarily, the tecli- 

 nic of the microbiologist together with, in part, the economic bearing of 

 the subject seems to be the determinant factor of limitation. 



Assuming, therefore, that the province occupied by microbiologists 

 consists of the study of unicellular life-forms, because such limitations 

 have been established by actual studies and investigations, through the 

 instrumentality of microbiological technic, it will be pertinent and 

 clarifying to provide a general graphic outline at the start. By this means 

 the student will be able to locate himself, whether he is just launching or 

 has gotten far out on the troublesome and most fascinating sea of micro- 

 biology. The graphic outlines will always be his ready chart. 



* Editor. 



