OF THE POTATOE. 437 
These results exhibit a very different estimate 
of the quantity of seed required in this country, 
with that mentioned before, unless some mistake 
may have occurred in the reduction of French 
weights to the English. 
The remarks subsequently made by Dr. Kane 
coincide with the results obtained in my own 
table. The kidney potatoe produced 103 tons, 
which yielded above 1 ton 18 ewt. of starch, while 
the crop of Strangers was 18 tons, which only 
produced a little more than 2 tons 8 ewt. of 
starch. 
Starch is obtained from the potatoe by a sim- 
ple process, which has been extensively circulated 
by Sir John Sinclair and others. Manufactories 
are established in France and in Scotland for its 
production, and many families in the latter coun- 
try, and in the north of Ireland prepare it in 
small quantities for domestic use, while in this 
country it has been neglected or unnoticed. The 
root of white briony will also produce starch by 
a similar process. 
When potatoe starch and arrowroot are exa- 
mined by the microscope, a difference is percep- 
3M 
