26 



CHEMICAL DEPARTME^'T. 



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

 reckoned as anhydrous potash (KgO). 

 Sulphate of potash (pure), contains potassium = 54% anhydrous potash. 

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

 potash. 



II. FEEDIXG 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 feeding 

 stutt's. The percentage of nitrogen contained in a cake multiplied 

 by 6j gives the percentage of albuminoids. 



Oils occur chiefly in seeds, and are of various kinds. Some are highly 

 nutritious. 



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

 These are sometimes called heat-producers. 



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

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

 and is therefore considered indigestible. 



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

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



Useful Factors. 



* By phosphate of lime is meant tricalcic phosphate (3CaO, P2O5). 

 t Monocalcic tribasic phosphate (CaO, 2H2O, P2O5). 



