¢ 10 4 
Some calculators have supposed, and on data not 
éasily refuted, that the maximum produce of this 
grain over the whole face of the globe, and in a se- 
ries of any ten given years, will not exceed six 
bushels reaped for one bushel sown.(}) 
~ VII. Of Peas. 
The pea is a native of the southern parts of Eu- 
rope, and is found growing spontaneously in the 
- western parts of our own continent. The family isa 
large one, containing several species; but of these, 
the field peu alone comes within the scope of our 
present purpose. Of this there are two varieties, 
denominated, from their colour, the grey and the 
green; both productive, and (when separated from 
the skin that surrounds them) a food of excellent 
quality for man, wholesome, nutritive and pleasant : 
‘and forcattle, whether in a dry or green state, much 
‘to be recommended. Sheep, cows and horses are 
‘particularly fond of them; and hogs are more 
promptly and economically fattened on a mixture 
of pea and barley meal, ina state of acetus fermen- 
tation, than by any other food. 
The structure of the roots would indicate, that 
peas are an exhausting crop; and it is on this evi- 
dence, that in Europe they are admitted only in 
long or six years rotations; but if we examine the 
leaves, in regard to both number and form, we will 
‘probably find reason to modify this opinion and al- 
dow, that by ‘stifling weeds, by checking evapora- 
(1) The reader will remember, that on our plan, turnips follow wheat, as they do 
rye, and without any difference in cultivation. See article 3d of this section. To 
sxepeat here what we have said there, would be useless, 
