362 



PUBLIC HEALTH BACTERIOLOGY 



SUMMARY OF SOME RESULTS OF WATER EXAMINATION. 



Artesian wells and springs, 4 to 100 bacteria per c.c. 

 Ordinary wells, 100-2000 ,, ,, 



Rain and snow, vary greatly, from 4 upwards. 

 River waters, vary greatly (see table on page 351). 



EXAMINATION OF VARIOUS WATERS (J. Hume Patterson). 



