APPENDIX 



229 



those compounds of carbon, hydrogen, and oxygen which 

 are soluble in dilute acids and alkalies are included, such 

 as sugar, starch, mucilage, pectin, etc. 



Fibre. — The remaining organic constituents which 

 are not soluble in the diluted acids or alkalies used by 

 the analyst are classed as fibre. The whole of this fibre 

 is not indigestible, but the amount capable of digestion 

 is very variable, and fibre is consequently usually classed 

 as of no feeding value. 



Ash. — This is the mineral or incombustible part of 

 food, composed of inorganic salts, a portion of which 

 is used for the formation of bone, etc. ; but by far the 

 greater portion is passed out in the excreta. 



Nitrogenous substances are frequently called ' flesh- 

 formers,' whilst fat and carbohydrates are designated 

 ' fat or heat formers.' 



Chemical Composition of Certain Foods. — From 

 analyses made .by the writer and other analysts, the 

 following table shows the 



Average Composition of Certain Foods. 



* Analyses by the writer. 



