IOWA ACADEMY OF SCIENCES. 
273 
owing to the destruction by fire of all of our cultures. We 
found present in the milk a large number of chromogenes, 
but none of these, of course, can be referred to, or are in 
any way related to the typhoid fever bacillus. On the 
other hand, we did find B. coli- communis, but it does not 
necessarily follow that the B. coli-communis comes from 
human dejecta, as this organism is very commonly found 
in connection with cow stables, and the organism being 
found quite frequently in the intestinal tract of animals as 
well as man. Therefore this cannot be considered to be 
the cause, nor as an argument against the use of milk. 
This work, however, was not completed, and hence a final 
statement cannot be made. 
COMPARISON WITH THE SEWAGE BACTERIA. 
The results of the work carried on on the College Sew- 
age Plant show the following conditions with reference to 
the purification, and it is of interest to compare these 
results with the water obtained from the Briley well. It 
will be seen that in every case, excepting the last one, that 
the Briley well contained many times more organisms 
than the effluent of either filter bed. 
DATE 
September ist . . 
September 2d. . . 
September 3d. . . 
September 4th.. 
September 5th.. 
September 5th.. 
September 5th.. 
September 6th.. 
September 7th.. 
September 8th.. 
September 9th.. 
September 10th. 
September 10th. 
September 10th. 
September nth 
September 12th. 
September 13th. 
September 14th, 
September 15th, 
September 16th. 
September 17th, 
September 17th 
September 17th 
September 18th 
September 19th 
September 20th 
September 21st. 
September 22d.. 
From 
Air 
Water 
Manhole 
Tank 
Effluent 
W. E 
W. E 
E. E 
W. E 
E. E 
Tank 
Manhole . 
W. E 
W. E 
W. E 
E. E 
Tank 
Manhole . 
E. E 
E. E 
W. E 
W. E 
W. E 
W. E 
E. E 
E. E 
Tank 
Manhole . 
W. E 
W. E 
E. E 
W. E 
E. E 
90 degrees 
72 degrees 
62 degrees 
63 degrees 
82 degrees 
83 degrees 
82 degrees 
90 degrees 
87 degrees 
68 degrees 
69 degrees 
70 degrees 
84 degrees 
85 degrees 
55 degrees 
65 degrees 
68 degrees 
50 degrees 
66 degrees 
72 degrees 
71 degrees 
79 degrees 
75 degrees 
71 degrees 
73 degrees 
72 degrees 
72 degrees 
68 degrees 
68 degrees 
72 degrees 
74 degrees 
74 degrees 
74 degrees 
62 degrees 
72 degrees 
73 degrees 
74 degrees 
72 degrees 
74 degrees 
74 degrees 
72 degrees 
70 degrees 
64 degrees 
68 degrees 
64 degrees 
65 degrees 
67 degrees 
67 degrees 
66 degrees 
1, 2x2, 000 
1, 363, 000 
696, 600 
242, 400 
424, 200 
484, 600 
960 
2, 400 
2, IOO 
390 
230 
I, 800 
460 
230 
310 
210 
440 
no 
1,200 
480 
IOO 
320 
3,600 
460 
340 
420 
18 
