29 



of sugar, cotton and rice to warmer ; of buckwheat, and 

 Indian corn, and wheat, to warmer and drier; of rye, barley 

 and oats, to colder and more uncertain climates. 



b. The nature of rust, smut, mildew, the maizg, brand, 

 (fee, and the circumstances of local climate most favourable 

 to their appearance — or 



4th. The relations of Geology and Vegetable Struchire 

 conjoined — such as 



That certain plants and soils are mutually adapted to 

 each other,because of the special structure and natural 

 habits of the plants, and the physical characters only of 

 the soils. 



The Valley of the Mohawk, for example, is remarkably 

 prolific in Indian corn, and raises comparatively little 

 wheat — while the district of Syracuse produces wheat 

 abundantly, and is less favorable to corn. So in Great 

 Britain and Ireland, we have our turnip and barley soils, 

 distinguishable readily, by the practical man, from the 

 wheat and clover soils. These differences are indepen- 

 dent of chemical composition, and are not to be explained 

 upon chemical principles. They are dependent upon the 

 special relation which the structure and natural habits of 

 the plants bear to the physical characters of the medium 

 in which their roots are made to grow — or 



5th. The general indications of Geology and Meteo- 

 rology conjoined — such as 



The relations of the nature of the rocks, of the soil, and 

 of the fall of rain taken together — 



a. To the necessity for under drainage, and the means 

 of effecting. 



b. To the necessity for artificial irrigation, and the easiest 

 mode of obtaining a supply of water for the purpose — or 



