72 



23 hunjan stools, only 4 gave the Voges-Proskauer reaction and of these 

 3 were obtained from a single sample. At the same time, a study of 51 

 strains from 5 samples of horses and 48 from 6 samples of cow manure 

 did not yield a single aerogenes culture. In 1909 he made further ob- 

 servations with similar results. 



Ferriera, Horta and Paredes reported 8 out of 117 lactose fermenting 

 strains from human feces, and 2 of 81 strains obtained from 46 different 

 species of animals to belong to the aerogenes section as indicated by a 

 positive Proskauer test. 



The work of Clemesha is particularly significant because of the large 

 number of cultures examined. Of 1207 human strains, about 6 percent 

 were found to be of the aerogenes type but a large number of these came 

 from a single sample. Among 1029 cultures from cow dung, Bad. (lactis) 

 aerogenes was encountered in about 10 percent. He records that in cow 

 dung, the Bact. aerogenes was found in small numbers, and Bact. cloacae 

 was sometimes very common, but that in human stools these types were 

 very rare and that a sudden increase in their prevalence was never ob- 

 served. Clemesha's observations were confirmed to a considerable extent 

 by R. G. Archibald of the Wellcome Tropical Research Laboratory in an 

 investigation of the water of Khartoum. 



TABLE XXXVI. INCIDENCE OF AEROGENES TYPES AMONG COLON BACILLI 



IN HUMAN DEJECTA. 



*Includes strains obtained from latrines, directly from feces, and fecal suspensions 

 exposed to action of sunlight. 



fThese comprised 46 strains isolated for the most part by special methods and 31 of 

 these strains were obtained from a single specimen. The true incidence of aerogenes types 

 is therefore considerably less than shown in the table. 



A11 Bact. cloacae. 



^Includes animal strains. 



