LOW GRADE NITROGENOUS MATERIALS, ETC. 6l 



most of the tannic acid. It is then acidulated with sulphuric acid 

 to fix the nitrogen and render it more available. This material 

 is being used by the manufacturers in the United States to quite 

 a considerable extent because it is cheaper than the more desirable 

 nitrogenous materials per unit of nitrogen. This product con- 

 tains about 8 per cent, nitrogen and is more valuable than raw 

 leather. 



Feather waste and various skin wastes are also saved for fer- 

 tilizing purposes. 



Hair and fur waste is rich in nitrogen. It is unsuitable as 

 fertilizer because it is so slowly decayed. When properly treated 

 with-sulphuric acid and rendered assimilative for plants it is more 

 valuable. Hair to a limited extent is often found in tankage. 



Mora meal is a vegetable product, brown in color, which is im- 

 ported from Europe. The mora seed, which are grown in India 

 and probably other tropical countries, are sent to Europe where 

 they are subjected to pressure and the oil extracted. The re- 

 maining pomace is ground and sold as mora meal. This product 

 has been used for the past nine years in the United States and 

 the consumption has increased every year. 



It carries about 2.5 per cent, of nitrogen which is of low avail- 

 ability. It is not sold with any guarantee of nitrogen, phosphoric 

 acid and potash, but on a flat basis. It is used by manufacturers 

 of commercial fertilizers principally as a dryer and filler. It is 

 good for both of these purposes because it is an excellent ab- 

 sorbent and bulky. 



Beet Refuse. — This compound is a grey black powdery sub- 

 stance. It contains from 5 to 7 per cent, nitrogen and about 

 0.5 to I per cent, potash. One manufacturer used this compound 

 in some of his mixtures because he believed it would kill in- 

 sects in the soil. He believed this because of the presence of 

 sulpho-cyanic acid in this compound. 



Scutch. — This is a by-product or waste product in the manu- 

 facture of glue and the dressing of skins. It is manufactured in 

 England and contains about 7 per cent nitrogen. 



Horn and hoof meal, horn shavings, etc., are products obtained 

 from slaughtering houses or by-products in the manufacture of 



