OF THE POTATOE. 425 
tons of tubers, produces 2 tons 3 ewt. of starch, 
while the acre of Slow Island potatoes, which 
produces 14 tons, gives only 1 ton 15 ewt. of 
starch. In cultivating the plant for the purpose 
of extracting this material, it is therefore of the 
greatest importance to attend to the existence of 
these varieties.” 
The next Table was first drawn up in order to 
show the relative productiveness of my own crop, 
and it was afterwards enlarged by the addition of 
varieties procured from other places. The ex- 
periments were made in the months of November, 
December, January, and February, before any 
signs of germination had appeared, and while the 
quantity of starch was at its maximum point. 
100 parts Produced 
1 cwt. seed 1 Stat. acre Gluten 
produced produced Water Starch & Fibre 
Leigh’s Blacks ... 
Sweeps, or Black | cwt. tons. 
Pink Eyes mean of ( 19 10t 76.3 16.0 7.7 
3 analysis ......... 
Red Champion | ae - 
TORI OF Si-sns00000 I ee Soe: 
Radicals mean of 7 te eee a 15.2). 60 
In Soil of similar quality. 
2 analysis ......... s 
IONEY? ses cevaredces J S105 974,58" 18.2 “70 
Golden Ball ......... 9 of eeso.e «616.4? 077 
Favmoen}i32, 002d. ac0a28 124 123 79.7 14.5 5.8 
Apple (Irish)......... 8 8 78.1 16.3 6.6 
