106 



MICRO-ORGANISMS IN WATER 



conclusions as to the bacterial condition of the actual 

 source of supply will be arrived at (see p. 62). 



The following table gives the results of examina- 

 tions of the deep-well water obtained from the chalk 

 and supplied to London by the Kent Company during 

 the years 1886, 1887 and 1888 l :- 



Bacterial Contents of Deep-well Water obtained from the Chalk 

 and supplied to London by the Kent Company (Percy Frankland) 



N.B. The samples referred to as ' supply ' were obtained from the mains in the company's 

 district, and represent not only mixtures of the water from the several wells mentioned in the 

 table, but also with the water of other similar wells belonging to the company. This water lias 

 also passed through the service reservoir, and, as would be anticipated, therefore the numbers 

 found are often considerably in excess of those discovered in the samples taken directly from the 

 wells. In nearly all those cases in which larger numbers, such as IGo. 59, 65, 67, &c.. were dis- 

 covered in the well-waters, it was found on inquiry that there had been' some irregularity in the 

 work at the well, such as recent repairs, interrupted pumping, &c. 



An artesian well at Mainz was found by Egger to 

 contain four organisms in a c.c. Hueppe found also 

 only four in a deep well attached to a slaughter-house 

 in Wiesbaden, whilst in an investigation of some artesian 



1 Reports to the Local Government Board on the M<mthly Bacterio- 

 logical Examinations of the London Water Supply, 1886, 1887, 1888, 

 Percy Frankland ; also Proc. Boy. Soc. 1893, vol. liii. p. 178. 



