62 LESSONS IN CHEMISTRY. 



mosphere its gases, and from the earth its minerals, for our 

 use. By the industry of the farmer, as I shall have occasion to 

 show, the amount of the above nutritive compounds may be 

 immensely increased, and, at the same time, the soil made to 

 support a greater number of plants, and consequently to afford 

 a larger amount of food for man. 



