IIo 
resistant organism, it not unfrequently persisted to the end 
in these. 
Unfortunately, the organism itself is a common one 
in feces, so that it may still be present in considerable 
numbers in any sample, without really representing any very 
considerable departure from the true fecal arrangement, but 
the figures in Chapter IX show that on the whole it is not so 
common in wet weather asit is in dry. It is an organism 
whose presence may give much valuable information, but on 
the other hand a good deal of care is required in drawing 
conclusions from results containing it. 
The following brief remarks concerning other common 
fecal organisms are given. As regards their powers of 
resistance to sunlight they all belong to class II. We do 
not consider that it is possible to divide these organisms 
further as they appear to be very similar in their powers of 
surviving adverse influence. 
Acidit Lactict (No. x or No. 2). 
This organism is usually found in small numbers in the 
feeces of man and cattle. Its presence is very constant. It 
has a slight tendency to predominate numerically in the feces 
of man. It is also found in small numbers in water samples, 
particularly those taken from rivers and lakes. In con- 
taminated earth it is fairly common, and it has on one occasion 
been isolated from ground, known to have been contaminated 
many months previous to taking the sample. Its entire 
absence from the water-supplies in the hot weather shows it 
does not rank with class III. Certain analyses in Chapter VIII, 
however, show that it survives till quite late in the exposure. 
A series of experiments, not yet complete, seem to show that 
it is very easily killed by desiccation. 
Levans No. 3.—This organism is extremely rare, only 
having been met with on two or three occasions. Once it 
was isolated from human feces, and once from Ootacamund 
sewage. No further details can be given. 
Bacillus No. 6.—Is a distinctly rare organism. It was 
isolated once from human feces. It is very much more 
