128 INTRODUCTION. 



tific theory, but is now generally approved and adopted; and a system of" 

 rotation,, in which crops cultivated with the hoe, alternate with the grains, has 

 been recently found an economical substitute for the former process of summer- 

 fallowing. A great advance in farming has been effected by the introduction of 

 root cro2)s into field culture. It is true that the labor of cultivation is expensive, 

 but it is abundantly repaid by increased production, and the superior condition in 

 which the soil i& preserved. Our farmers have generally been very neghgent in 

 regard to improving the breed of domestic animals. Recently, however, the 

 efforts of a few public spirited persons in introducmg cattle, swine and sheep 

 from improved stocks in Europe, have been crowned with high success. The 

 race of horses has been less improved. It is to be hoped that the time has passed 

 when efforts in this important department of agriculture must encounter popular 

 prejudice and ridicule. In England the advance in weight of cattle, sheep and 

 lambs, has averaged at the Smithfield market, as estimated by different indivi- 

 duals, at different times, as follows : In 1810, cattle, twenty-six stone six pounds ; 

 1830, thirty-nine stone four pounds ; 1840, forty-six stone twelve pounds : in 

 1810, sheep and lambs, two stone ; 1830, three stone eight pounds ; 1840, six 

 stone six pounds. Although it cannot be affirmed that an equal advance has 

 been made here, yet very beneficial effects have resulted as well from the greater 

 care practised in feeding and raising stock, as from the introduction of improved 

 breeds from abroad. The merino blood in sheep has been so extensively diffused 

 since its introduction here in 1809, that it is supposed none of the former race 

 of that animal remains unmixed in the country. Among the animals which have 

 been introduced, are the Short horns, Hereford, Devon and Ayshire cattle ; the 

 South down, Leicester and Coteswold sheep ; the Berkshire, Irish grazier and 

 Kenilworth swine ; and pure bloods or crosses of some of these animals are 

 found in every county, if not in every town in the state. At the present time, 

 thirty-five bushels of wheat per acre is not considered a great crop, and the pro- 

 duct frequently reaches forty and even fifty bushels. Seventy-five or eighty 

 bushels of corn per acre is not an extraordinary yield. We cannot speak with 



