Utilisation of Town Seimgc. 
83 
and the sewaged grass ; and those in the Tables of detail 
show that the great bulk of the produce varied more than the 
mere mean results here given would indicate. 
" The chief point of remark is, that the solid matter of the 
much more luxuriant and succulent sewaged grass contained a 
considerably higher proportion of nitrogenous substance than tliat 
of the unsewaged. It also contained somewhat more, both of the 
impure waxy or fatty matter extracted by ether, and of mineral 
matter, Avhich may be taken to indicate a less advanced or ripe 
condition at the time of cutting. But, owing to the generally 
less ripe and more succulent condition of the sewaged than the 
unsewaged grass, it is highly jirobable that a larger proportion of 
its nitrogenous substance was in an immatured condition ; and, 
so far as it was so; it would be less available for the formation 
of the nitrogenous compounds of flesh or milk. It would at any 
rate be unsafe, without further evidence on the point, to attribute 
the higher milk-yielding quality of the dry substance of the 
sewaged grass unconditionally to its higher proportion of nitro- 
genous substance ; and, it may be remarked that, according to 
such a rule, a given weight of the dry substance of the third and 
fourth crops should be very much more productive than an equal 
quantity of that of the first ; for the Table shows that there- was 
twice or thrice as high a proportion of nitrogenous substance in 
the solid matter of the crops grown late in the season as in that of 
those grown in the earlier and more genial periods of vegetation. 
Nor is the evidence at present at command such as to justify the 
conclusion that the superior milk-yielding quality of the dry 
substance of the sewaged grass is essentially connected either 
with its larger proportion of impure fatty, or of mineral matter. 
That the greater succulence of sewaged grass conduces at least to 
quantity of milk, experience seems to show ; and that the con- 
stituents of its solid matter are in a readily convertible condition, 
the results of this first season's experiments on the question seem 
clearly to indicate. 
" It remains to be seen how far the results of a second year's 
series of experiments, conducted with the greater attention to 
some points of detail which past experience suggests, Avill serve 
to confirm, modify, or further explain the conclusions to which 
the results given in this section seem to point. 
" VI. Composition of the Milk ijielded from the Uaseicayed and 
from the Seicaged Grass. 
" Once a week, during the greater part of the experimental 
period, the morning and evening milk of the two cows fed on 
unsewaged grass was mixed together, and a gallon sample of the 
G 2 
