AMQEB.E OF THE INTESTINAL TRACT. 159 



teriologically has resulted, in my experience, in about 

 40 per cent, of the cases showing a mixed infection 

 with some other organism. My observations as re- 

 gards the bacteriology of the pus in liver abscesses 

 confirms that of many others who have found that in 

 about one-half the cases there is a mixed infection. 

 It is in these cases, also, that we find the yellow or 

 greenish pus, rather than the reddish or chocolate- 

 colored pus which is so typical of amoebic infection. 

 As regards the frequency with which other organisms 

 are found, Futcher investigated 27 cases, in which he 

 found Staphylococcus aureus in 6, Bacillus coli com- 

 munis in 5, usually associated with other organisms; 

 Streptococcus pyogenes in 3, and Micrococcus 

 lanceolatus and Bacillus pyocyaneus in one, each; 

 while 12 showed only the amoeba?. Councilman and 

 Lafleur, in 2 cases, found Bacillus coli communis in 

 one. Kruse and Pasquale found streptococci in three 

 dysenteric abscesses, staphylococci in two, and bacilli 

 resembling those of typhoid (probably coli com- 

 munis) in four. 



The peculiar form of liver abscess which I have 

 described is associated only with certain forms of 

 dysentery due to infection with pathogenic amoeba?. 

 To one who has had sufficient experience in the study 

 of such forms of dysentery there can be no doubt 

 of the etiologic relationship of the amoeba? to it and 



