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 thia 

 from 18.5 the loss during exposure to red heat, we shall have 

 16.18, the proportion of water. The oxide of iron was sepa- 

 rated from the solutions after the addition of acetic acid, by 

 ammonia, and weighed 26 parts. 



100 



AGRICULTURE AND ECONOMICS. 



Art. XVII. On the Comparative Quantity of Nutritious 

 Matter which may he obtained from an Acre of Land when 

 cultivated with Potatoes or Wheat, by Dr. Eli Ives, Pro- 

 fessor of Materia Medica and Botany in Yale College. 



J.N a good season an acre of suitable land well cultivated 

 will produce 400 bushels of potatoes. In Woodbridge, a town 

 adjoining New-Haven, a crop of 600 bushels of potatoes has 

 been obtained from a single acre. A bushel of potatoes 

 weighs 56 pounds. Multiply 400, the number of bushels, by 

 56, the weight of a single bushel, gives 22400, the number of 

 pounds of potatoes produced 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 con- 

 sidered as nutritious matter. 



According to the experiments of Dr. Pearson and Einhoff, 

 about one-third of the potato is nutritious matter. From the 



