Practical bacteriology, microbiology and serum therapy (medical and veterinary) : a text book for laboratory use / by A. Besson ; translated and adapted from the fifth French edition by H.J. Hutchens.

  • Besson, Albert, 1868-
Date:
1913
Catalogue details

Licence: In copyright

Credit: Practical bacteriology, microbiology and serum therapy (medical and veterinary) : a text book for laboratory use / by A. Besson ; translated and adapted from the fifth French edition by H.J. Hutchens. Source: Wellcome Collection.

    893/928 (page 861)
    To give some concrete notions with regard to the nature and number of organisms found in water some figures may be abstracted from Dr. Houston's reports. Taking the London Metropolitan water supply for the year ending March 31st 1909 :— 1. Total number of organisms (Gelatin plates at 20°-22° C. 3 days).— River Thames. River Lea. New River. Raw water (organisms per c.c.) - 2558 8794 1118 Filtered water (organisms per c.c.) 11*3 18-9 6-1 2. “ Typical ” colon bacillus test.— River Thames. River Lea. New River. All London Waters. Raw waters - Filtered waters - - 15 j)er c.c. 25 per c.c. 1 per c.c. 2 per litre. The bacteriological examination of sewage. Houston's method of water examination is equally applicable to the investigation of the nature and number of organisms present in sewage. In this case, of course, the sewage must be diluted to a far greater extent than is necessary in the case of water and it will be necessary to examine 0000,001, 0-000,000,1 and even 0-000,000,01 c.c. for the presence of colon bacilli.]