204 



An American Fruit-Farm 



cells, and are no more helpful to the vine or the 

 tree than hot coals or iron pigs. 



I prefer the processes of Natiu*e, on the fruit- 

 farm, to the laboratory at Cornell, or the factory 

 in Buffalo, or Chicago. Cover-crops, such as the 

 clovers, plowed in, supply nitrogen; ashes supply 

 potash and some other ingredients, as lime. Phos- 

 phoric acid is supplied by stable manuire, by guano, 

 by South Carolina or Florida rock, or by ground 

 bone. ' 



^ The average composition of the most important farm manures and 

 of the commercial fertilizers is shown by the following tables: 



Commercial Potash Fertilizers: Average Composition of Potash Salts: 



