30 



The Feeding of Animals 



A 1 1 vegeta 

 ble or aiii 

 mal matter . 



Incombustible 

 or inorganic 

 matter . . . 



Combustible 

 or organic 

 matter . . . 



Water. . . . -/Oxygen 



\^ Hydrogen 



f Oxygen 

 Sulfur 

 Chlorine 

 Phosphorus 

 Silicon, Fluorine 



■^^^ < Potassium 



Sodium 

 Calcium 

 Magnesium 

 Iron 

 , Manganese 



C Carbon 

 Oxygen 



I Hydrogen 

 Protein ...... Nitrogen 



Sulfur (generally) 

 Phosphorus (sometimes) 



, Iron (in a few cases) 



Carbohydrates f Carbon 

 and fats . . i Oxygen 



L Hydrogen 



The ash, which, on the average, constitutes about oue- 

 twentieth of the plant, and never more than one-teuth 

 of the animal, may contain thirteen of the fifteen 

 elements, while the larger proportion of living matter 

 consists mostly of the compounds of three or four ele- 

 ments, in no case of more than six or seven. From 

 this point of view, it becomes strikingly evident that 

 the dominant elements of life, quantity alone consid- 

 ered, are those derived from the air and water. 



WATER 



Water fills a very important place in agriculture. 

 It is everywhere present, generally in some useful way. 

 All plant substance, all animal tissue, foods and nearly 



