INTROnrCTION 9 



of many materials used or produced on the 

 farm. In jiractic*', chomistry aids the farmer 

 '•liit'dy in su,iri;''sting how ho may focd phint-^ 

 fertilize the land) and animals. So many and 

 important are the aids which chemistry extends 

 i«> aiirrieulture, that the various sul)jects involved 

 have heen associated under the name of "agri- 

 cultural chemistry." This differs from other 

 cliemistry not in kin<l, hut only in the suhjects 

 whieh it considers. 



19. Climatology'. Climate determines to a 

 large extent the particular treatment <^r caie 

 which the farmer gives his crops and stock. It 

 also profoundly inlluences jtlants and animals. 

 Tliry change when climate changes, or when 

 they are taken to otlu?r climates. Climate is 

 therefore a ])owerful agency in ])ro<lucing new 

 hreeds and new varieties. The science of 

 weather, or meteorology, is also intimately 

 associate<l with the work of the farmer. 



"JO. Ot'ology. The agricultural possihilities of 

 any region are intimately associated with it> 

 surface geolog}', or the way in which the soil 

 was formed. A knowledge of the geology of 

 his region may not greatly aid the farmer in 

 tile prosecution of his business, hut it should 

 adtl nuich interest an<l /.est to his life. 



-1. We now api)rehend that agriculture is a 

 complicated and diflicult husincss. Founded 



