Gl-;^'I•:RAL considkration of diskase. 



53 



by Pasteur about 1865, whose classical experiments 

 establishing bacteriology as a science. (It is po; 



also a 

 ible th 



idcd in 

 at bio- 











St 



Fiff. 21, — Sliowint^ 



1. Micrococcus. 



2. Strtptoccns. 



3. Diplococcus. 



different forms of Coeoi. 



4. Tetrails. 



5. Sarcina. 



chemists may produce life, (animate objects), l)y synthesis of 

 inanimate substances which will only represent the achieve- 

 ments of ultratechnical scientists and will not signil}- that spon- 

 taneous generation occurs in nature). Thirt}' or forty \ears 

 ago the stud)' of bacteria was looked upon as a fad by the 

 majority of the people. However, the practical application of 

 bacteriologic knowledge in medicine, sanitation, the -various 

 arts and agriculture, has caused bacteriology to assume its 

 present important position as one of tlie principal biologic 

 sciences. 



'^'? 



Ik. 



Fig. 



-^'arious forms of Bacilli. 



Bacteria are found everywhere that animals or higlier plants 

 have grown. They are practically omnipresent. 



1^5 



\^ 



-N ''h 



—Various forms of Spirilla. 



Bacteria are single celled plants, each indi\idual possessing a 

 cell body and a cell membrane. The cell body is principally 

 composed of protoplasm, which may be homogeneous or granular. 

 In some instances non-protoplasmic particles may be present. 

 Chromatin, the essential nuclear material, is regularly distrib- 

 uted throughout the entire cell body and no doubt functions 

 the same as a nucleus. Granules that are intensely stained 

 with methylene blue occur in the body of some bacteria, but 

 their significance is not known. The cell bodies of some 1)acteria 

 contain starch granules while those of others contain sulphur 



