INTESTINAL BACTERIA 239 
THE INTESTINAL FLORA. BY A. DISTASO 
Lancet, 182 (1912), 496-98 
A. Gram Negative Bacilli. 
1. B. coli group. 
2. B. variabilis group. (Anaerobic bacteria with round extremity.) 
3. B. thetaiotaomicron group. (Bacilli very polymorphic, elliptical form.) 
4, B. rigidis group. 
5. B. preacutus group. (Bacillus swollen in the middle and pointed ex- 
tremities.) 
B. Gram Negative Cocci. 
1. Sarcina citrea group. (Very common in the mouth and feces, similar in 
appearance to the gonococcus.) 
2. Diplococcus obliculus group. (Strict anaerobes.) 
3. Parvulus group. (Strictly anaerobic, small cocci.) 
C’. Gram-Positive Bacilli. 
1, B. Acetogenes group. The greater number of the gram-positive bacilli 
belong to this group. The bacillus acetogenes B is its chief repre- 
sentative, since the B. bifidus and B. acetogenes A are very rare 
. in the feces examined in London. 
2. Streptobacillus group. This microbe always exists in the intestinal 
flora. 
3. Diploc. acuminatus group. An anaerobic bacillus. It produces burytic 
acid. 
4. B. perfrigens group. An anaerobic microbe. It produces enormous 
quantities of lactic acid. 
. B. edematic maligni group. With the B. sporogenes (Metchnikoff). 
. B. rodella group. Anaerobic group with very long bacilli. 
. A lemon-shaped bacillus, which is stained by iodine and is described by 
the author as being butyrous acid-producing microbe. It has not 
yet been obtained pure. 
“Io? or 
D. Gram-positive Cocci. 
1. Enterococci group, in chains, less frequently diplococei. 
2. Small cocci group. Are also to be seen corresponding in size to the 
coccus Banani, to the Staphylococcus pyogenes, and to the Staph. 
asaccharolyticus. 
In addition three kinds of spores are to be found. . 
1. Oval spores; rather large, which may belong to B. sporogenes and to 
other. 
2. Round spores, which may belong to B. putrificus (Bienstock-Tissier) 
or to the bacillus of Rodella and to the B. Alkaligines anaerobicus. 
8. Very small spores, strongly refractile, belonging to the B. perfrigenes. 
