CHEMICAL DEPARTMENT. 25 



II. Reports of Analyses of FEEDING STUFFS. 



L Albuminoid compounds, . . 



Valuable constitiients I Oil, 



( Mucilage, Sugar, Starch, &c., 



Woody Fibre, . . . . 



Moisture, ..... 



■^sn, . . . . . 



Nitrogen, 



INTERPRETATION OF ANALYSES. 



The following notes will be found useful in enabling those unacquainted 

 with chemistry to interpret analytical reports : — 



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, called also 'i , • ^ t, aco, 

 Tricalcic phosphate, and ^" "*^^^f. ^^^^^ .f ^^ 



Tribasic phosphate of lime. ) Phosphoric acid. 



Soluble — 



Soluble phosphate of lime, called also \ . • ^ ^ n^ o/ 

 K •^ ^^ . \} *- f T 1 ( contains about 61 / 



Acid pJiosphate oi lime, and errone- > , ■, • • i 



ously Monobasic phosphate of lime, ) pnospnonc acia. 



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 



80 much tricalcic phosphate. 



t! i„i 1^ 1 ,^1 t. T4.' ^^ T \ 11 ( uives the efiuivalent of 



holulde phosphate, multiinied by IJ ) '^ . • i • ^ i i . 

 T>;, u^ 14. 1 1 < tricalcic phosphate 



Liphosphate, „ „ U| ^^^^^^j^_ 1 P 



The words soluble "pliosphate are frequently used in place 

 oi jphosphate of lime rendered soluble. 

 Phosphate of magnesia occurs in small ([uantity in bones, itc, and is 



usually reckoned as tricalcic phosphate. 

 Phosphates of iron and alumina when occurring in small quantity 

 are usually reckoned as tricalcic phosphate. 



N.B. — To save ambiguity all pliosphates should be described as 

 containing so much anhydrous jiliosphoric acid (P.^O.^) in a 

 soluble or in an insoluble state. 



This amount multij)lied by 2183 would then give the 

 equivalent of tricalcic phosphate. 



(2.) NiTRor.KN occurs in manures mostly in three forms. Ammonia salts, 

 nitrates, and albuminoid mutter. 



Ammonia sulpliati; (]>ure), contiiins 25? % ammonia. 

 Ammonia clilori<K! (pure), „ 3l| „ „ 

 Nitrjite of soda (pure), contains 1()'47 % nitrogen, tnpial to 20 % 

 ammonia. 



