20 CHEMICAL DEPARTMENT. 



II. Eeports of Analyses op FEEDING STUFFS. 



( Albuminoid compounds, 

 Valuable constitiients I Oil, ..... 



I Mucilage, Sugar, Starch, &c., 



Woody Fibre, 



Moisture, .... 



xxsn, . • . • . 



Nitrogen, 



KOTES KEGAEDING ANALYSES. 

 I. MANURES. 



The three items of greatest importance in manures are phosphoric acid, 

 nitrogen, and potash. 



1. Phosphoric Acid is present in manures as such, and also as phos- 

 phates of lime, magnesia, iron, and alumina. 



Phosphate of Lime is most important, and exists in two states, insoluble 

 and soluble. 



Insoluble — 



Insoluble phosphate of lime, caUed also | contains about 46% 

 Tricalcic phosphate, and V pi^^g h^ric acid. 



Tnbasic phosphate oi lime. ; 



Soluble — 



Soluble phosphate of lime called also | ^^^^^.^^ ^^^^^ g^o. 

 Acid phosphate of lime and erroneously \ phosphoric acid. 

 Monobasic phosphate oi lime, ; 



Some analysts prefer to state the soluble phosphate as 

 Biphosphate of Lime, called also ) contains about 72% 



Monobasic phosphate, ) phosphoric acid. 



The soluble phosphates are usually stated as equivalent to 

 so much tricalcic phosphate. 



r. -, n -u -u 4- T^.- T 1 1 11 (gives the equivalent of 



Soluble phosphate, multiplied by l^- ^ ^ ^^-^^^^-^ phosphate 



Biphosphate, „ „ 1^ ^ nearly. 



The term " soluble phosphate " is generally used in place of 

 phosphate of lime rendered soluble. 

 Phosphate of magnesia occurs in small quantity in bones, &c., and is 



usually reckoned as tricalcic phosphate. 

 Phosphates of iron and alumina when occurring in small quantity 

 are usually reckoned as tricalcic phosphate, but if the quantity is 

 considerable it should be separately estimated. 



j\r,jg. To save ambiguity all phosphates should be described as 



containing so much "^ anhydrous phosphoric acid (P2O5) in a 

 soluble or in an insoluble state. 



This amount multiplied by 2-183 would then give the 

 equivalent of tricalcic phosphate. 



2. Nitrogen occurs in manures mostly in three forms — Ammonia salts, 

 nitrates, and albuminoid matter. 



Ammonia sulphate (pure), contains 25|% ammonia. 

 Ammonia chloride (pure), „ 31| „ „ 

 Nitrate of soda (pure), contains 16 '47 % niti'ogen, equal to 20 % 

 ammonia. 



