20 
ences which are at present unknown. These influences have 
been proved to operate over very wide areas. 
(2) That within certain very wide limits, these torces 
appear to affect man and animals equally, both as regards 
number, and kind of micro-organisms. 
(3) That under well defined conditions, such as heavy 
rainfall, the water-supplies contain the same organisms as 
the feeces of men and animals at that particular time; but 
that this similarity of bacteriological flora is also noticed 
occasionally when rain is absent and there 1s no apparent 
cause for it. The explanation of this occurrence is at present 
unknown. 
(4) That having regard to the variation in the bacteria 
in feces, both in quantity and kind, no constant approximate 
composition can be arrived at. Even in the large groups, ~ 
suggested by MacConkey, variation in percentage composi- 
tion in the same animal is considerable. 
(5) No lactose fermenting organism has been isolated 
by us that has been proved to be the inhabitant of the intes- 
tinal tract of cattle, or man only. 
(6) That the numerical relation of the organisms con- 
stituting MacConkey’s groups in the intestine of cattle in India 
is entirely different from that in England ; while in the intes-. 
tines of man it appears to be very similar in the two countries. 
(7) That a study of the organisms present in feces at 
different times of the year is necessary for the proper inter- 
pretation of the results obtained from water analyses. 
