ii6 
THOMPSON YATES LABORATORIES REPORT 
2. Welh. — Experimental investigation is made from time to time to ascertain the number 
of bacteria present in the bore-holes and issuing from the numerous fissures at the bottom of the 
well. Analyses are also made of the water at various periods under ordinary conditions of 
pumping. 
3. Dead Ends. — From time to time the water in the dead ends of the mains is investigated, 
samples being taken at minute intervals during the 10 to 15 minutes when the pipe is being 
flushed. 
4. Service Reservoirs. — These are from time to time examined. Bacterial analyses are also 
made to ascertain the effect of varying rates of filtration upon the filtered water ; also the condition 
of the filtered water after passing through a newly-made bed, or bed the surface of which has 
been scraped. 
At Oswestry the water engineer has constructed numerous small test-filters, and the 
effluent from these is periodically examined. 
5. Deposits and Filtering Materials. — From time to time quantitative and qualitative 
analyses are made of the deposits forming in the interior of the unfiltered water-pipes ; also of the 
sand composing the filter-beds, and of the sand at the bottom of the wells. 
11. The Routine Investigations 
These are — 
(«) Daily ... Drinking water supplied to city and collected on Mount Pleasant. 
{h) Fortnightly Ashton Hall tap. 
(t) Monthly ... The three wells — {a) Windsor, {b) Dudlow Lane, (c) Green 
Lane ; the Rivington and Vyrnwy water at Prescot, and the 
mixed water at Prescot. 
At the present time the analysis is quantitative and qualitative, and the standard is that 
the water contains — 
{a) Less than 100 bacteria per c.c. 
{b) No B. Coli 
[c] No B. cnteriditis sporogenes. 
RESULTS OF THE ANALYSES IN 1899 
Daily Analyses 
Since the 4th December to 3rd February, 1900, the average number of bacteria per cubic 
centimetre in the drinking water supplied to the city, and obtained every morning from a public 
drinking fountain in Brownlow Hill, corner of Mount Pleasant, is 24 per c.c. 
Fortnightly Analyses 
These have been made from a tap in Ashton Hall (Museum of Hygiene) supplied directly 
from the main. Average number of bacteria 55 per c.c. 
