26 



CHEMICAL DEPAETMENT. 



Albuminoid matter contains about 16 % nitrogen, equal to about 

 19 % ammonia, which sooner or later becomes available as 

 plant food. 



(3.) Potash is found in small amount in most manures, and should be 



reckoned as anhydrous potash (KoO). 

 Sulphate of potash (pure), contains potassium = 50 % anhydrous potash. . 

 Muriate of potash (pure), contains potassium = fully 63 % anhydrous 



potash. 



II. FEEDING STUFFS. 



These are chiefly concentrated forms of food whose value depends on 

 the amounts they contain of albuminoids, oil, and carbohydrates. 



Albuminoids are compounds containing nitrogen, and more or less 

 resemble dry flesh in their composition. They are sometimes 

 called flesh formers. They are the most valuable constituents of feed- 

 ing stuff's. The percentage of nitrogen contained in a cake multi- 

 plied by 6|- gives the percentage of albuminoids. 



Carbohydrates are compounds such as sugar, starch, gum, and cellulose. 



Woody fibre is the name given to that part of the cellulose, which is 

 insoluble when boiled in weak solutions (5%) of acids and alkalies, 

 and is therefore considered indigestible. 



Good linseed, cotton, and rape cakes shoukl contain from 4% to 

 5 % nitrogen, about 10 % oil, and about 6 % ash. 



Useful Factors. 



By phosphate of lime is meant tricalcic phosphate (Gag Pg Og). 



