CERTAIN PYOGENIC BACTERIA 69 



EXERCISE XXIX 

 A STUDY OF CERTAIN PYOGENIC BACTERIA 



108. There are a number of bacteria which are able to cause 

 suppuration, but ordinarily the formation of pus is due to the 

 presence of certain streptococci and micrococci. A number 

 of bacilli, especially B. coli communis and Ps, pyocyaneus, are 

 frequently found as the apparent cause of suppuration. As it is 

 impossible to study more than a very few of these species, two 

 of the most common and one more rarely encountered organ- 

 ism in suppurating wounds and abscesses are chosen for special 

 study. 



References. — Chapters on pyogenic bacteria in text and refer- 

 ence books. Christman (recherches sur la suppuration), Annals 

 de rinst. Pasteur, II. (1888), p. 469, Lucet (in animals). Ibid., 

 VII. (1893), p. 325 ; Von Lingelsheim (concerning streptococci), 

 Zeitschrift fiir Hygiene, Bd. X. (1892), S. 331 ; Moore, Am. Vet. 

 Review, Jan., Feb., and March, igoo. 



109. Work for this Exercise. — Inoculate a tube of each 

 medium in Groups A and B, from each of the cultures of the 

 following bacteria which will be furnished. Streptococcus pyo- 

 genes and Micrococcus pyogenes aureus. 



Read carefully the chapter on pyogenic bacteria in the text- 

 book. 



Give in your laboratory notes a short abstract of one of the 

 articles referred to above. 



