373 
lbs. 
The weight of nutritive matter afforded by the produce of the T. macrorhi- 
zum, exceeding that of the T. pratense, in proportion nearly as 7 to 15 2297 
The proportional value of the grass of T, pratense, to 
that of T. macrorhizum , is 1 0 to 1 1 . 
The weight of nutritive matter afforded by the T. macrorhizum exceed- 
ing that of the Medicago sativa, in proportion nearly as 13 to 33 - 2552 
The proportional value of the grass is as 11 to 6. 
The weight of nutritive matter which is afforded by the produce of the 
T. macrorhizum , exceeding that of the Hedysarum onobrychis in pro- 
portion nearly as 5 to 67 - - - - - - - - 3897 
The proportional value of the grass, like that of the 
T, pratense, is as 11 to 10. 
The produce of each of the above-mentioned species 
was taken from a similar soil, and in the same situation ; the 
conclusions must therefore be considered positive with 
respect to such soils only. It is evident that more than 
twice the quantity of nutritive matter is afforded by the 
produce of one acre of the T, macrorhizum, than from the 
produce of an equal space covered by the T. pratense. Its 
short duration in the soil (for if sown early in the autumn, 
on a rich light soil, it is only an annual plant) renders it 
fit only for green-food or hay ; this in some measure lessens 
its value when compared with the T, pratense. It possesses 
the essential property of affording abundance of good seed ; 
and if the ground be kept clear of weeds, it sows itself, 
vegetates, and grows rapidly, without covering- in, or any 
operation whatever. For four years it has propagated 
itself in this manner, on the space of ground which it now 
occupies, and from which this statement of its comparative 
value is made. The produce of lucern in grass comes 
nearer to this species in quantity, but is greatly deficient in 
nutritive matter, as much as 13 to S3. The long continu- 
ance of lucern in the soil is therefore the only merit which 
it possesses above the two last-mentioned species ; and when 
that is the object of the cultivator, it will of necessity have 
the preference. 
The value of the grass of saintfoin is equal to that of the 
T, pratense > and proportionally less than that of the 
Trifolium macrorhizum, as 10 to 11. The quantity of 
grass is very small, and on soils of the nature above de- 
scribed, it is doubtless inferior. However, from the 
superior value of the grass, on dry hilly situations, or 
b b 3 
