DRIED BLOOD AND WOOL-WASTE. 



253 



95.0 per cent, of that compound. The amount of nitric acid 

 present is equal to 19.16 of ammonia or 15.77 per cent, of 

 nitrogen. As the Chili saltpetre has been sold during the 

 larger period of the past year at four cents per pound, or 

 $80 per ton of 2,000 pounds in the retail trade, the nitrogen 

 in that form has cost 25 cents per pound. The use of this 

 nitrogen compound, as a top-dressing, after manuring with 

 phosphates, receives increased attention. 



Dried Blood. 



Sample No. II. was sold by a dealer in Chicago, 111. ; No. 

 I. and No. III. were taken at a storehouse in Boston ; No. III. 

 consisted, as stated, of ground meat and blood, manufactured 

 by a firm in Pawtucket, R. I. These articles have been used 

 quite extensively as a source of nitrogen in compound com- 

 mercial fertilizers ; they are a very valuable material for that 

 purpose, provided they have not been scorched by the use of 

 too high a temperature during drying. As they disintegrate 

 quite readily at ordinary temperature in the presence of 

 moisture, they furnish during the first year of application a 

 valuable source of nitrogen plant-food. One pound of 

 nitrogen in the form of dried blood and dried meat has been 

 sold at from 20 to 21 cents. There are several grades of 

 dried blood in our market, as has been stated in previous 

 reports. 



Wool-waste. 



The material which has served for the subsequent analysis 

 was obtained from a mill at Franklin, Mass., and consisted 

 mainly of a coarse wool-refuse, apparently the sweepings of 

 the mill. The sample tested lost at 100 to 110° C. about 10 



