Utilisation of Town Sewage. 81 
" Table VII. — Showing the Amounts of Dry Substance in the Unsewaged 
and Sewaged Grass. 
FnssT Season, 1861, 
Mean per cent. Dry Substance iu Fresh Grass. 
Fir«t Crop. 
Second Crop. 
Third Crop. 
Fourth Crop. 
Five-acre Field. 
Plot 1 (Unsewaged) 
Plot 2 (Sewaged) .. 
Plot 3 (Sewaged) . . 
Plot 4 (Sewaged) .. 
25-1* 
30-4* 
15-8* 
27-9 
30-5 
26- 9 
27- 7 
24-4 
19-8 
14-2 
13-7 
13-4 
13-7 
12-9 
15-4 
9-6 
Ten-acre Field. 
f 
Plot 1 (Unsewaged) 
Plot 2 (Sewaged) .. 
22-0 
26-9 
23-3 
17-1 
12'6 
16-9 
Plot 3 (Sewaged) .. 
Plot 4 (Sewaged) .. 
21-4 
15-1 
7-3 
15-1 
18-4 
16'1 
14-4 
17-8 
" The figures given in the above table show that the proportion 
of the dry substance in the grass varied very much indeed 
according to circumstances. The first crop contained generally a 
higher proportion than the second, particularly in the case of the 
sewaged grass ; and the second, a higher proportion than the third 
or fourth. It also appears that the unsewaged grass averaged a 
higher proportion of dry substance than the sewaged. These 
results are quite in accordance with what would be expected from 
the known variations in the conditions of growth. The exact 
proportions of dry substance found, and recorded in the Table, 
depended, however, very much indeed upon the stage of growth 
at which the produce of the respective plots or crops was cut, 
and upon the condition of the weather at the time of cutting. 
Thus, the first crop of sewaged grass, particularly in the 5-acre 
field, was, for the most part, too ripe when cut, and hence the 
very lai-ge relative proportion of dry substance which on the ave- 
rage it contained. Again, in both fields, a considerable portion 
of the second crop of the unsewaged grass was much riper when 
cut than that of the sewaged. On the other hand, some of the 
crops, especially portions of the third and fourth, Avere cut and 
sampled in a very wet condition, and to this, in a certain sense, 
* " These samples -were taken before June 20, and were, by mistake, weighed 
with scales not sufficiently accurate for the purpose ; the results are, therefore, 
given separately." 
VOL. XXIV. G 
