396 THE ROHAN POTATOE. 
by the kindness of one of the Prince’s friends ; 
for this seed has not yet been sold in France. I 
received them in November, 1836; divided them 
amongst my agricultural friends at Cadishead, and 
the environs, with a copy of the method for their 
culture, and reserved one for my own experi- 
ments. It weighed about 2ibs.; gave seventeen 
sets, and produced 185fbs ; affording an average 
of 11 ibs. per set. 
My heaviest was of 33fbs. The manure I 
made use of, was of an animal nature, being re- 
fuse from my manufactory of prussiate of potash; 
I used also the propping sticks. Each stalk had 
many buds, but, with little exception the buds 
fell off before opening ; I observed, however, a 
few very small white flowers, which were closed 
about half an hour after sunset. Nothing like 
a fruit was ever produced from them. The 
potatoes, when dug out, were heaped in a close 
perpendicular pillar round the stalk, and the top 
ones were so near the surface of the soil, that 
many were half uncovered. The horizontal roots, 
which extend from 25 to 30 inches, are of the 
thickness of a good quill, but bear no fruit. 
In 1838 I made my second experiment ; but the 
