EXERCISE. 



BACILLI OF DYSENTERY. 



A number of bacilli have been isolated from the intes- 

 tine from cases of dysentery. The first of these organisms 

 seems to have been described by »Shaga who isolated it from 

 cases of dysentery in India. Since his work was published 

 a number of bacilli very closely related to the one he 

 described, if not identical with it, have been found in this 

 country. In this exercise one or more of these organisms 

 will be studied. 



References.— Shiga, Centralblatt F. Bakt. Vol. XXIII, 

 p. 599. Deutsche Med. Wochensch. Vol. XXVII, p. 741. 

 Kruse Ibid -p. 370. Duval and Bassett, Am. Med. Vol. IV, 

 p. 417. Gay, Univ. Penn. Med. Bulletin, Vol. XV, p. 307. 

 Duval and Gay Ibid Vol. XVI (1903), p. 177. Flexner /6zfl? 

 Vol. XIV, p. 190. 



Work for this Exercise. — Study and carefully de- 

 scribe the culturas of dysentery bacteria made in the last 

 exercise. 



Examine in the hanging drop and in stained cover-glass 

 preparations in the bouillon and gelatin cultures. Describe 

 the morphology and make a drawing of a few bacilli giving 

 their size by actual measurement. Compare carefully the 

 cultural characters of this organism with those of hog 

 cholera, typhoid and colon bacilli. 



