B. COLI 



137 



rearranged into the four general groups in Table LV and Orr's 

 results ^ added for comparison. 



Table LV 



Saccharose +dulcite +• 

 Saccharose — dulcite + . 

 Saccharose +dulcite — . 

 Saccharose — dulcite — . 

 Other strains 



MacConkev. 



Human 

 Fseces. 



Per Cent. 



32.2 



.27.0 

 4.5 



28.0 

 8.3 



Animal 

 Fseces. 



Per Cent. 



48.1 

 34.3 



8.4 

 9.2 



Orr. 



Milk 

 from 

 Cow- 

 shed. 

 Per Cent. 



28.5 



13.8 



43.9 



12.6 



1.2 



Milk 



from 



Retailer. 



Per Cent 



26.5 



10.4 



39.1 



20.4 



3.6 



Milk 

 from 

 Con- 

 sumer. 

 Per Cent. 



26.1 

 12.8 



41.1 



16.7 



3.3 



Manure. 

 Per Cent. 



18.7 



35.4 



33.4 



8.4 



4.1 



The results of Rogers et al.,^ who investigated 107 colon 

 organisms obtained from milk products, and some unpubUshed 

 ones of the author on the biochemical characters of coliform 

 organisms obtained from 226 samples of milk, are given in 

 Table LVI. 



Table LVI 



The author's results, obtained with samples of the Ottawa 

 milk supply, are somewhat in accordance with Orr's results as 

 regards the predominance of saccharose fermenters, but show a 

 larger proportion of dulcite fermenters. This predominance of 

 saccharose fermenters accords with the results recorded for 



