66 
EOTAL HOBTICULTUEAL SOCIETY. 
Ill each of the first series of diagrams, Nos. 1 to 6 respectively, 
is shown the results of one only of the six maiiurial conditions 
but on each of the twelve plants. The coutinuous line re- 
presents the amount of dry substance produced (above ground) ; 
and each horizontal division, numbered from the base line up- 
wards, represents one ounce of such dry produce. Thus the 
diagrams 1 to 6 show, graphically, the actual and relative amounts 
of dry substance produced, which are recorded numerically in the 
six columns of Table I. (p. 64). It need hardly be explained tliat the 
amount of dry substance is a true measure of the amount of growth 
attained above ground, in each case, at the time of cutting. To 
aid the conception of the results, it may be added that each 
ounce of produce on the experimental area of 4 square feet cor- 
responds to rather more than 6 cwt. per acre ; or, to put it 
in another way, 16 ounces, or 1 lb., corresponds to 97| cwts., or 
nearly 5 tons of dry produce per acre. 
A glance at the six diagrams, side by side, shows that under 
no condition of manuring did any one of the six grasses quite 
attain to 16 ounces of produce, whilst generally they yielded less 
than half, and sometimes only about a quarter as much, though 
in several cases the Lolium gave nearly as much. Of the Legu- 
minosae, neither the Trifolium pratense nor the Trifolium repens 
ever reached 16 ounces ; whilst the Lotus corniculatus did so 
under each of the six different conditions of manuring ; and in 
several cases attained to nearly once and a half that amount. Of 
plants of other orders, the Flantago in every case exceeded the 
amount of growth of the Lotus ; and in every case but one it 
exceeded that of any other plant among the twelve ; in fact, in 
several cases the produce of Flantago corresponded to more than 
8, and in one to more than 9, tons of dry vegetable matter per 
acre. The AcJiillea, too, in two instances exceeds, in another 
equals, and in the remainder falls little short of, the produce 
of the Lotus. The Carum (biennial), on the other hand, gave 
under each condition of manuring the smallest amount of produce 
above ground in tliis first year's growth, though the amount of 
matter in its fleshy root, stored up for future use, probably ex- 
ceeded tliat of any other description of plant. 
Studied in detail, the facts he.re but briefly summarized afford 
striking illustrations of the varying powders of accumulation and 
assimilation of plants of difterent families, of different genera of 
the same family, and even of different species of the same genus, 
