274 
IOWA ACADEMY OF SCIENCES. 
From September 28d to September 28th, inclusive, the 
sewage effluent pipe was under water, hence no samples. 
DATE. 
From 
Air 
Water 
Manhole 
Tank 
Effluent 
September 29th 
E. E 
69 degrees 
68 degrees 
72 degrees 
64 degrees 
64 degrees 
65 degrees 
67 degrees 
980 
460 
360 
September 30th 
W. E 
October 1st 
W. E 
October 1st 
Tank 
568, 400 
October 1st 
Manhole . 
896, 600 
October 2d 
W. E 
80 degrees 
75 degrees 
81 degrees 
80 degrees 
72 degrees 
63 degrees 
40 degrees 
67 degrees 
67 degrees 
67 degrees 
67 degrees 
68 degrees 
68 degrees 
68 degrees 
62 degrees 
61 degrees 
70 degrees 
1, 200 
3 bo 
1, 800 
450 
1, 200 
2, 100 
1,800 
October 3d 
E. E 
October 4th 
W. E.... 
October 5th 
E. E 
October 6th 
E. E 
Ortoher 7th 
W. E 
October 8th 
E. E 
October 8th 
Tank 
260, 000 
October 8th 
Manhole . 
W. E 
1,333, 200 
Ortoher 9th 
63 degrees 
2,400 
From 10th to 18th, inclusive, the beds were being 
cleaned and the sewage was turned directly into the creek 
from the tank. 
October 14th. 
October 15th 
October 15th 
October 15th 
October 16th 
October 17th 
October 18th 
W. E 
63 degrees 
63 degrees 
63 degrees 
63 degrees 
63 degrees 
64 degrees 
62 degrees 
62 degrees 
61 degrees 
W. E 
Tank 
1, 2r2, 000 
Manhole . 
W. E 
* 
60 degrees 
55 degrees 
63 degrees 
W. E 
E. E 
* Too thick to count. Estimated at 5,000,000. 
360 
210 
120 
120 
130 
CONCLUSION. 
It may be stated that so far as the analysis show the col- 
lege water supply may be considered excellent. It is true 
that in a number of instances more organisms were found 
than at other times, but an examination made from time to 
time shows that the number is not unusually large, and on 
the whole that we may consider our water supply practi- 
cally pure, and I should also state that the water from the 
spring supply is unusually good. We should bear in mind 
that the failure to find the typhoid fever bacillus in the 
water supply or milk of the Briley well is not at all 
surprising. It is a well known fact that the saprophytic 
species grow so readily in the nutrient media that 
the typhoid fever bacillus has not the same chance 
to grow. The same may also be said with reference 
to milk, only here we are dealing with such a large 
