102 



ABSTRACTS 



Association in their 1912 report, that the colony count on agar be 

 adopted as the standard, has not met with the approval of many- 

 bacteriologists. In order to secure more data on this subject the 

 Illinois State Water Survey began a series of comparative tests. A 

 large number of analyses was made of which 4379 are considered in 

 this paper. 



In order to reach a more definite basis for comparison the analyses 

 were arranged in the following classes according to their sources. The 

 table indicates the ratios which were found. In each case the agar 

 count was taken as unity. 



Deep wells 



Shallow wells 



Raw Lake Michigan water 



Raw river water 



Treated water 



s 



1-76 



1-68 



1-633 



1-250 



1-35 



The relation of agar colonies to gelatin colonies on those samples 

 showing the larger number on agar does not exceed 10 to 1, with one 

 exception and this exception results from the consideration of only three 

 analyses. With those samples showing the greater number on gelatin, 

 the ratio does not exceed 1 to 10, except in one case and this again 

 is on raw Lake Michigan water. This would seem to indicate that 

 in badly polluted waters we might expect a high ratio, but with pure 

 waters the counts on the two media closely approach each other. 



Scientific Methods of Control in the Mineral Water Industry. Frank 



L. Rector. 



Methods of protecting the source and handling the product of the 

 Great Bear Spring Company from the spring to the consumer are dis- 

 cussed. This company owns 600 acres of land comprising the entire 

 watershed of a group of springs, 11 in number, whose flow is about 

 one-half million gallons daily. The springs are situated five miles 

 south of Fulton, New York. 



Some 360,000 evergreen trees have been used to reforest this tract 

 of land. Water from three of the springs is used. The springs are 

 enclosed in enamel or glass-lined steel caissons with light-proof covers. 

 They are perfectly protected from surface drainage. 



The water is shipped in large tanks, also glass and enamel-lined, of a 

 capacity of from seven to ten thousand gallons. Cars are sterilized 

 by steam at 10 pounds pressure for one hour before filling. After 



