68 
THOMPSON YATES LABORATORIES REPORT 
From the above table it will be seen that the average number of bacteria 
per ex., as the result of 36 analyses, is 614,158. 
The average number of B. coli in 23 analyses is 10,036. 
The number of times in which the B. enteritidis sporogenes is present in .01 
c.c, in 28 analyses, is 23. 
Bacteriological Analyses of the Land Drain Effluent of the 
West Derby Farm 
Of 8 determinations the average number of bacteria per c.c. was 17,887, and 
the average number of the B. coli 50 per c.c. The B. enteritidis sporogenes was 
present in the 1 c.c. in 2 out of 5 determinations. It will therefore be seen that the 
land filtration gives better results than filtration through the artificial beds. 
Observations upon the Sand Filter Bed (Bed 3a) 
As previously stated the effluent from this bed has been very much clearer 
than those derived from the other 2 contact beds. It has also not undergone 
decomposition upon incubation. On the other hand bacteriological analyses show that 
the numbers of B. coli still remains high. 
West Derby Sand Bed Effluent 
Date 
Bacteria 
B. coli 
B. enteritidis 
sporogenes 
November 28th, 1899 
I 1,400 
December 11th, 1899 
26,867 
20,850 
Sand Filter Bed 
January 22nd, 1900. — The bed had become clogged by deposit on the 
surface. An analysis of the effluent gave the following results : — 
January 22nd, 1900 
Bacteria per c.c. 
B. coli 
per c.c. 
B. enteritidis 
sporogenes 
Effluent from Rough Coke 
Bed running on to Sand. . . 
1,085,000 
777 
Absent in o.oi c.c. 
Sand Effluent 
23,800 
533 
Present in i c.c. 
„ after 1 hour... 
28,600 
663 
Absent in 0.01 c.c. 
