28 
on this occasion were not carefully emulsified (for reasons 
which do not concern this work), so that this particular mixture 
cannot be looked upon as being of exactly the same strength 
from day to day (as a matter of fact, the 4 hours’ oxygen figure 
shows it varies very little) ; I c.c. of this mixture was diluted 
into I0, 100, 1,000, and 10,000, and plates were made in the 
usual way. 
In the table are also given the number of coliform colonies 
which grow upon Conradi Drigalski, side by side with the 
small streptococci colonies. This is an useful piece of informa- 
tion, because if there wasa numerical disproportion between 
the two it would be apparent from these plates. 
The third part of the table gives the results obtained 
from cowdung, the method of examination being the same as 
for human feces. 
The points which are apparent from this table, are first 
of all that streptococci are extremely numerous in crude 
feces, frequently being present in I-10,000 and I-100,000 of 
a gramme. They do not appear to be frequently found in 
smaller quantities than this. Also it is apparent from this 
table that streptococci are, roughly speaking, about as 
numerous as lactose fermenters, though comparing these with 
Dr. Houston’s figures both streptococci and coliform organisms 
seem to be much fewer in number per gramme. The number 
of any kind of organism per gramme of feces is obviously an 
unsatisfactory method of counting, though it is difficult to 
suggest a better, because faces does not necessarily contain 
a constant quantity of water all over the world. It is possible 
that the fecal material in this country contains more water 
and less solid material than it does in England, but whatever 
is the reason we find that both coliform organisms and strep- 
tococci are considerably less numerous per gramme of crude 
feeces in the tropics, than they are in a cold climate. 
In making these statements, however, we wish it to be 
noted that it is highly probable that the number of strepto- 
cocci per gramme of faeces varies at different times of the year. 
Thus, we have obtained a certain amount of evidence to show 
that in the dry weather they appear to be fewer than in the 
rains. 
