555 
Table II shows the Virginia dairies visited only once. Of the 31 
wells of this series which were pronounced good on sanitary inspection, 
9 showed neither chemical nor bacteriological pollution, 4 showed 
both, 19 showed B. coli, 16 showed chemical pollution. 
In the springs visited once, 22 were pronounced good on sanitary 
inspection, and 8 of these showed neither chemical nor bacteriological 
pollution, 18 of these showed no chemical pollution, 9 no bacterio- 
logical pollution, 1 showed distinct chemical pollution, and 13 bacterio- 
logical pollution. 
Of the 16 springs which were pronounced bad from the sanitary 
survey, 5 showed neither chemical nor bacteriological pollution, 11 
showed no chemical pollution, 9 showed no bacteriological pollution. 
Only 1 of the 17 cisterns showed neither chemical nor l^acterio-' 
logical pollution, 7 showed both, and the others showed either one or 
the other form of pollution. 
Table III. — Virginia dairies examined twice. 
