56 
17 
BHAGHALPUR.—25-II-II. 
Name 
or 
Number, 

Sacchar. 
Adonite. 
Inulin. 
Vi 2: 
Indol 
Motility. 
— 

—}| Vesiculosus. 
Coscoroba. 
Do. 
Mutabilis. 
Coscoroba. 
Do. 
Cloace. 
L. xrogenes, 
Do. 
Coscoroba. 

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Another most interesting fact is also shown by our work, v72., 
that out of 35 samples of river water taken at Howrah 
Bridge, where we know there is gross pollution from Calcutta 
and Howrah, not more than about 5% of all samples taken 
in wet and dry weather show any appreciable widening of 
the acid and gas line in the two media. 
Of course, it is apparent that work on rivers can never 
give as definite results as on lakes, because the whole way 
along both banks more or less pollution is being added. It is 
possible to select a lake for research work where we know 
that actual pollution is only added when rain is washing it 
from the catchment area into the lake. 
When one considers the extent of these investigations, 
coupled with the results obtained by others already quoted, 
there can be no reasonable doubt that a very vital change 
takes place in the arrangement of organisms which are present 
in fresh feces after it has passed into water. The extreme 
rarity of the group glucose + lactose —has already been 
mentioned, and yet a few days after fecal material has 
passed into either rivers or lakes, these organisms greatly 
predominate. Again, the results of the work mentioned 
above demonstrate the fact that the more recent the pollution, 
the closer is the acid and gas line in the two media to one another. 
This latter statement is of great importance, and we shall show 
