64 Eeport of the Acting Director and Chemist of the 



Leather-Scraps and Leather-Meal are waste products of vari- 

 ous factories. When treated with superheated steam and dried or 

 roasted, they can be very finely ground. ■ Roasted, finely ground 

 leather is used to adulterate dried blood, having much the same 

 appearance. The use of these materials in commercial fertilizers is 

 forbidden by law in this State, except the fact be stated on the 

 package. 



Meat-Scraps, Tankage, etc., are slaughter-house refuse, dried 

 and ground. It differs from azotin and ammonite in usually con- 

 taining more bone and, hence, more phosphoric acid. Good tank- 

 age contains 10 per cent, or more of nitrogen and often 10 per cent. 

 or more of phosphoric acid. 



Nitrogenous Guanos are formed in dry regions. The Peruvian 

 guano was rich in nitrogen, containing 7 per cent, or more, mainly 

 in the form of sulphate of ammonia. Guanos of this kind have 

 largely disappeared from the market. 



The following table gives the approximate quantities of nitrogen 

 contained in various fertilizing materials : 



Table Giving Approxoiate Amount of Nitrogen in Fertilizing 



Material. 



materials containing nitrogen. 



(1) Mineral materials. 

 Muriate of animouia. . 



Nitrate of potash . 



Nitrate of soda 



Salphate of ammouia. 



(2) Vegetaile materials. 



Cotton-Mjecl meal 



Castor be.u pomace . 

 Tobacco stbys 



(3) Animal m,ate'Kqjs. 

 Azotiu, ammODt.c,. _ 



Dried blood , 



Dried fish 



Hair 



Hoof meal, horn dust"^ 

 Leather scraps, leathef 



Meat scraps 



Nitrogenous gnatios. 



Oleouiargariue refuse -\ 



Taukage .... 



Wool waste 



Average per 

 cent, of nitrogen. 



25 to 26 

 13 to 14 

 15 i to 16 

 19 to 20.^ 



6 to 7 

 5 to. 6 

 2 to 2i 



10 to 12 



10 to 15 



7 to 8 



14 to 16 



10 to 15 



7 to 8 



10 to 12 



7 to 8 



10 to 12 



7 to 9 



5 to 6 



Pounds of nitro- 

 gen in 2000 pounds 

 of matenaL 



500 to 520 

 160 to 280 

 310 to 320 

 380 to 410 



120 to 140 



10) to 120 



40 to 50 



200 to 240 

 200 to 300 

 140 to 160 

 280 to 320 

 200 to 300 

 140 to 160 

 200 to 240 

 140 to 160 

 200 to 240 

 140 to 180 

 100 to 120 



