INTRODUCTION 9 



of many materials used or produced on the 

 farm. In practice, chemistry aids the farmer 

 chiefly in suggesting how he may feed plants 

 (fertilize the land) and animals. So many and 

 important are the aids which chemistry extends 

 to agriculture, that the various subjects involved 

 have been associated under the name of "agri- 

 cultural chemistry." This differs from other 

 chemistry not in kind, but only in the subjects 

 which it considers. 



19. Climatology. Climate determines to a 

 large extent the particular treatment or care 

 which the farmer gives his crops and stock. It 

 also profoundly influences plants and animals. 

 They change when climate changes, or when 

 they are taken to other climates. Climate is 

 therefore a powerful agency in producing new 

 breeds and new varieties. The science of 

 weather, or meteorology, is also intimately 

 associated with the work of the farmer. 



20. Geology. The agricultural possibilities of 

 any region are intimately associated with its 

 surface geology, or the way in which the soil 

 was formed. A knowledge of the geology of 

 his region may not greatly aid the farmer in 

 the prosecution of his business, but it should 

 add much interest and zest to his life. 



21. We now apprehend that agriculture is a 

 complicated and difficult business. Founded 



