THE ROHAN POTATOE. 395 
Light soil, first opened to the depth of about 
one foot and a-half, is well manured ; the animal 
black, or the animalized black, seems to answer its 
purpose the best. Each tubercula is cut into as 
many sets as it represents sound eyes; the sets 
placed at thirty inches one from another, are 
planted in March, and taken out at the end of No- 
vember, if prudence does not require it sooner. 
In France the plant appears at the beginning of 
May; and for nearly a month the soil must be 
heaped round it, to strengthen the stalk, which 
attains the height of seven, and often eight feet. 
To get its fruits of the largest size possible, it is 
recommended to prop the stalks with sticks of six 
or seven feet in length, and to fix horizontal sticks 
so as to enframe the stalks of it, at the height of 
about three feet and six feet. The largest tuber- 
cula of this species produced in France, weighed 
15fbs. 2o0zs.; and the greatest produce from one 
set was 27ibs. The small ones, and those of a 
middle size, are generally round. ‘Those above 
2ibs.are a sort of ludi nature. The largest arelong 
shaped ; their external appearance is rough, and 
the eyes lie deep in, witha purple tinge. Thinking 
that the cultivation of this peculiar kind of vege- 
table might benefit this country, I succeeded in 
importing about a dozen of good-sized tuberculas, 
