104 HATCH EXPERIMENT STATION. [Jan. 



The above-mentioned materials are products obtained by 

 hygienic treatment of city garbage. Sample No. 1 was ob- 

 tained by heating the selected garbage in vats under pressure ; 

 by this method the fats are recovered ; and the organic 

 nitrogenous matter is preserved for use as a nitrogen source 

 in fertilizers. In this process, however, the greater part of 

 the potash and other salines are leached out. Sample No. 2 

 represents the product obtained by the cremation of city 

 garbage. In this material the nitrogen has been sacrificed, 

 but the potash is retained in the ashes. The products from 

 both of these processes furnish valuable material for fertiliz- 

 ing purposes ; they should always be bought and sold on a 

 statement of guaranteed composition. 



