B,, 100 



44 THK BACTERIAL FLOKA OF RACHITIC STOOLS, 



A.W., aged 14 months. 

 MacConkey's medium 

 Endo's medium 

 Acid lactose-agar ... 

 Nutrient agar 

 Alkaline lactose-agar ... White sarcina, 100 

 Acidity ... ... ... Neutral 



Ty|)ical bacterium=atypical coli : Bac. colt conmmuis : : 5 : 3 

 Typical streptocoocus=none. 



S.B., aged 5 mouths. 



MacConkey's medium ... B,., 98; B^, 2 



Endo's medium Bg, 100 



Acid lactose-agar ... ... B^, 98; B^, 2 



Alkaline lactose agar ... No growth 

 Nutrient agar ... ... B^, 100 



Acidity ... ... ... 1 grui.=04 c.c. j~ acid 



Typical bacterium = Z?ac. coli coinmunis {immohilis). 

 Typical streptococcus=noiie. 



The analyses show that the flora of the dejecta of normal 

 children is very much the same as that of tlie children affected 

 with rickets, so far as the bacteria of the co^i-group are concerned. 

 But there is a difference in the comparative absence of the 

 streptococci. 



These were rather conspicuous in the stools of the cases of 

 rickets, growing even on Endo's medium, and thus in the analyses 

 they were prominently brought before one. Such was not the 

 case with the normal children, and indeed it is with regard to the 

 streptococci that an}' difference can be found between the dl.5- 

 eased and the healthy condition. 



According to Tissier,* ths Eaterococcus, the chief strepto- 

 coccus of the rachitic stools, can withstand an acidity of from 2 

 to 2'45, while Bac. coli succumbs when 1-73 is reached. From this 

 we infer that it is capable of producing a relatively greater 



' Annales de I'lnstitut Pasteur 19, 109. 



