~Table 32--Classification of Daily Bacterial Counts in the Filtered-Water Reservoir During the Period, November 1st, 1905, to February 1st, 1908.~ ==========================+==============+====================== Bacterial count between: | No. of days. | Percentage of whole. --------------------------+--------------+---------------------- 0 and 20 per cu. cm. | 291 | 41.0 20 and 40 per " " | 245 | 34.6 40 and 60 per " " | 63 | 8.9 60 and 80 per " " | 30 | 4.2 80 and 100 per " " | 28 | 4.0 92.7 --------------------------+--------------+---------------------- 100 and 200 per " " | 29 | 4.1 200 and 300 per " " | 13 | 1.8 300 and 500 per " " | 5 | 0.7 500 and 1000 per " " | 5 | 0.7 7.3 --------------------------+--------------+---------------------- | | 100.0 ==========================+==============+====================== The tests for _Bacillus Coli_ in Table 5 show results which correspond closely to these, with this organism detected only infrequently, except during the periods of high bacteria, and both of these are parallel to the turbidity variations in the filtered water. These variations follow closely the variations in the turbidity and in the bacterial content of the water applied to the filters. By all standards of excellence, the sanitary quality of the water during the greater part of the time is beyond criticism. In view of the close parallelism of turbidity and bacterial results in the applied and in the filtered water, it is entirely logical to conclude that, if the quality of the applied water could be maintained continually through the winter as good as, or better than, it is during the summer, then the filtered water would be of the perfect sanitary quality desired throughout the entire year.