336 Fermentation of Glucosides by Bacteria of Typhoid- coli, etc. 



fermenting powers and. become pathogenic should it find a suitable medium 

 such as the alimentary canal, and regain its old characters when outside the 

 body. This is, however, only a suggestion which at present is in no way 

 proved. 



In view of the results obtained with the typhoid-coli group of organisms, 

 it seems quite possible that other organisms may show similar changes, and 

 that the fermentation tests worked out by Mervyn Gordon for the Strepto- 

 cocci may also be inconstant if the same means of experimentation are 

 employed. 



In conclusion, I have to thank the Eoyal Society for the Government 

 grants which enabled me to purchase the glucosides used in this research, 

 and also Dr. MacConkey for many of the typical cultures used. 



REFERENCES. 



1. Mervyn Gordon, Thirty-third Annual Report of the Local Government Board, 

 1903—04, Supplement. 



2. Andrewes and Horder, ' Lancet,' 1906, September 15, 22, and 29. 



3. MacConkey, * Journal of Hygiene,' 1905, vol. 5, p. 333. 



4. Klotz, ' Journal of Infectious Diseases,' 1906, Suppl. No. 2, February. 



