THE 



SCIENCE OF AGRICULTURE. 



GENERAL VIEW OF THE SUBJECT. 



It appears that a difference in the species only 

 of animals and vegetables was originally created, 

 and that the different varieties were left to be 

 determined by the casual or accidental com- 

 binations and operations of original principles or 

 causes. In the production of variety in ani- 

 mals and vegetables, no doubt climate has the 

 preponderating influence, and next to this food 

 and lodging ; but in the general course of nature, 

 these three grand principles operate in unison, 

 and when all concur in one effect, the greatest 

 distinctions are produced. 



Food being the most effective and essential 

 cause of variety in the value of animals, this has 



B 3 



