: Dr. Ives on Potatoes. 297 
was broken, and obtained over mercury the carbonic acid in the 
usual manner. This was equal to 2.32; by deducting this from 
_ 18.5 the loss during exposure tored heat, we shallhave 16.17, 
the proportion of water. The oxide of iron was separated from 
the solution, after the addition of acetic acid by ammonia, and . 
weighed 26 parts. 
SHIGE ss in te kee Sale 
Alumin@. . +. .n-- soceee 
Tee a. es ae 
Carbonic acid... ..--...' 252 
: Wael, vo fi sc a Bee 
Oxide of iron... 225.263 
100. 
4 AGRICULTURE AND ECONOMICS. 
—S4o— 
Ant. XVII. On the Comparative Quantity of Nutritious Matter 
_ which may be obtained from an Acre of Land when cultivated 
with Potatoes or Wheat, by Dr. Exa Ives, Professor of 
» Medica and Botany in Yale College. 
\ 
Ty & good season an acre of suitable land well cultivated will 
produce 400 bushels of potatoes. In Woodbridge a town adjoin- 
ing New-Haven, a crop of 600 bushels of potatoes has been obtain- 
edfrom a single acre. A bushel of potatoes weighs 56 pounds. 
Multiply 400, the number of bushels, by 56, the weight of asin- 
gle bushel, gives 22400, the number of pounds of potatoes pro- 
duced upon one acre. 
Thirty bushels of wheat are considered a good crop as the 
Product of one acre of land. About £ of wheat may be consid- 
ered as nutritious matter. 
According to the experiments of Dr. Pearson and Einhoff, 
about one-third of the. potato is nutritious matter. From the 
Vou. 1....No. 3. 2 
