152 REPORT — 1872. 



tons. 



The quantity of sewage from the town received on tlie farm from 

 March 25th, 1871, to March 24th, 1872, inclusive, is, according 

 to the gaugings 410,787 



The quantity of efliuent water returned from the land to the 



tanks and rejnimped, during the same period, is 52,406 



The quantity of sewage, dilute or otherwise, which we have to 



account for is therefore 469,253 



According to the cropping table the quantity of 

 sewage applied to the cropped land (chiefly by 

 jiumping, hut also to a small amount by gravita- 

 tion) during the aforesaid period is 380,227 tons. 



Mr. Gooch (the adjoining farmer) was supplied with 4,131 



There was applied to the garden (wliich is not 



reckoned as part of the farm proper) 933 



Total quantity 385,291 tons utU'ized. 



Leaving 83,902 tons, ■which quantity was run upon a plot of land at the 

 lower part of the farm by gravitation and simply filtered, during periods 

 when it could not be put on the farm, owing to further drainage-works 

 being in progress. 



Prom Table III. it appears tliat the 380,227 tons of sewage so used con- 

 tained 21'0245 tons of nitrogen, and that the total amount of effluent water 

 l"unning from the subsoil-drains during the twelve months, viz. 195,536 tons 

 (of which 52,460 tons were returned to the tank, and repumped with the 

 sewage on to the land, and the remainder discharged into the river Rom), 

 contained 2-2430 tons of nitrogen, or approximately one tenth part of that 

 applied in the sewage. 



It must, however, be remarked that the figures in the columns marked * are 

 calculated from the results of the analyses of the sewage and effluent water 

 during the corresponding period of the present year (1872), as the method 

 of analysis employed before July 1871 did not give results in the same 

 denomination as that now used. 



The total amounts of nitrogen in the sewage and effluent water respec- 

 tively were calculated from the results of the analyses during the various 

 l^eriods ; and the absolute averages were, for the sewage 5-529 parts, and for 

 the effluent water 1-147 part in the 100,000. 



In Table IV. "will be found a detailed description of the crops, arranged 

 according to the plots into which the farm is divided. The figures in columns 

 III., VII., X., and XI. are as exact as possible, but those in columns VIII., 

 IX., and XII. are at the best only approximations. The figures in column 

 VIIL, from which those in columns IX. and XII. are deduced, profess to 

 represent the quantities of sewage applied during the twelve months to the 

 several crops and plots ; but it is obvious that with the means at the disposal 

 of the Committee no precise measurements of these quantities could be ob- 

 tained ; for to gauge the quantities of sewage applied at various times to 

 twenty-four plots with separate subdivisions, each having its own conduit, 

 would require a preliminary outlay in plant estimated at £500, and the con- 

 stant services of four additional educated assistants at probably not less than 

 £250 a year each. The only way, therefore, that even approximate figures 

 could be obtained for this column was by recording the number of acres to 

 which the measured daily total quantity of sewage was applied, and assuming 



