396 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



name of Artificial Guano of Stummer, which has found much 

 favor with the agriculturists. It is manufactured from hu- 

 man excrements, in four modifications, so as to best supply 

 the different wants of different crops as grass, grain, pota- 

 toes, etc. In Italy the dung of fowls is highly valued, and an 

 article of commerce. Dealers mix it with feathers, by which 

 the amount of nitrogen is greatly increased. In most coun- 

 tries it is not to be had in sufficient quantities for the trade, 

 but it is well worth collecting when there is an opportunity. 

 The escape of ammonia can be prevented by the application 

 of an occasional sprinkling of sulphate of iron. 2 A, March, 

 1872. 



