274 



IOWA ACADEMY OF SCIENCES. 



From September 23cl to September 28th, inclusive, the 

 sewage effluent pipe was under water, hence no samples. 



From 10th to 13th, inclusive, the beds were being 

 cleaned and the sewage was turned directly into the creek 

 from the tank. 



Too thick to count. Estimated at 5,000,000. 



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 



