ON TICK TRE.iTMENT AND UTILIZATION OV SEWAGE. 



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t^ (*• tr 



the town from time to time. The cnlculated amounts for the past years arc 

 as Ibllows : — 



The figure for 187-1-75 is of course obtained by using the result of the one 

 analysis made that year. From these figures we see that the amounts of 

 nitrogen delivered on to the farm in the sewage were approximately the same 

 during the first two years of the observations, and that they have increased 

 during the last two. 



Table IV. gives as usual a detailed account of the crops grown, and the 

 facts relating thereto arc summarized in Tables V. and YI. 



From Table V. it will be seen that the total produce of the farm was under 

 2115 tons, or less than last year, and less than the average of the last four 

 years, which was 2232 tons ; and the main reason of this is the considerable 

 increase in the acreage of cereals and of pulse grown, thus : — 



About Table VI. the same remark must be made as was made last year, 

 viz. that the acreage of Italian rye-grass includes the spring sowings as well 

 as the regular crops ; aud this accounts for the small average produce per acre 

 of that crop ; the three regular plots of this crop yielded respectively 68, 53, 

 and 48 tons per acre. 



The mangold crops were also very fine and gave the highest total tonnage 

 per acre yet recorded for those roots, viz. very nearly 47 tons per acre. 



The nitrogen recovered in the crops was 20,558 lbs., a somewhat larger 



♦ This is not tlie amount idilhal, as given in tLe Report for 1871-72, but the amount 

 recfived, as shown in the Report fi>r 1872-73. 



