费城的过滤和非过滤结果。
The bacteriological tests of water from the various plants show a great reduction in typhoid fever in sections of Philadelphia supplied with filtered water. Since January 1 last there have been only seven cases in that section of West Philadelphia that receives filtered water. The population served is 41,424. The number of cases in the section receiving a mixed supply of filtered and raw water was 273 cases in a population of 140,517. In the Twenty-first and Twenty-second wards, which received filtered water from the Roxborough plant, there have been thirty-seven cases to a population of 113,750 since the first of the year. The Twenty-third, Twenty-fifth, Thirty-third and Thirty-fifth wards get their supply direct from the Delaware river. In these wards there have been 1,035 cases of typhoid fever since January 1 to a population of 144,968. For a similar period in the Twenty-eighth and Thirty eighth wards, which receive unfiltered Schuylkill river water, there were 132 cases of typhoid in a population of 89,142. The comparisons tend to show that the Delaware river water is more conducive to typhoid fever than the raw Schuylkill water, and a study of the reports shows that the typhoid fever will he reduced at least eighty-five per cent, when all the water supply is filtered.
After another engineer's report on the contract bids for the construction of the Cross River mn-
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