AMOUNT OF SEWAGE PER CAPITA 115 



in the case of No. 25, the waste which was curtailed for two 

 days was allowed to continue. It is pointed out also that 

 the marked change in rate in the case of No. 5 was due to a 

 visit of a small boy who delighted in sailing a toy steamboat 

 in the bathtub of the house. During the ten days of his stay, 

 he was drawing water for this purpose at the rate of 800 gallons 

 per day, or he was instrumental in changing the per capita 

 rate from 47 to 146 gallons per day. 



From this table, Mr. Croes concluded that since the reason- 

 ble use, as indicated by the meter readings of the first 18 houses, 

 was 351.9 gallons per house, the amount wasted was the 

 average for the 25 houses, viz., 705.3 gallons less that amount, 

 or 351.9 gallons, practically 50 per cent. 



In the large tenement-houses of New York, however, the 

 consumption per head is much less than the above would 

 indicate. Thus the next house to No. 25 above, was a tenement 

 with 36 occupants and the water-consumption was 10.6 gallons 

 per head per day. Another tenement on the west side made 

 from two old residences, had 50 occupants and used water at 

 the rate of 5.6 gallons per day per capita. 



The use of water for trade and manufacturing purposes 

 shows a great variation in different communities. Brackett's 

 report gives the actual amounts used in Boston; but without 

 the number and size of the manufacturing industries his figures 

 are of little value. The table is given, however, to show the 

 relative amounts of water used by the different industries. 



In New York it was found that the amount of water used 

 in buildings where some business was carried on was remarkably 

 uniform, after the well-known largest consumers had been 

 required to install meters. It was considered safe to estimate 

 that on the average each metered tap in New York would 

 deliver 1450 gallons per day, this amount having been found 

 to hold almost exactly, year after year. 



After duly considering all the available data, Mr. Brackett 

 found that the amount used in the Boston Metropolitan District 

 for trade and mechanical purposes was about 25 gallons per 



