30 



The .Feeding of Animals 



A 1 1 vegeta- 

 ble or ani- 

 mal matter 



Incombustible 

 or inorganic 

 matter . . . 



Water. 



Ash 



Combustible 

 or organic 

 matter*. . . J 



Protein 



Carbohydrates 

 and fats . 



f Oxygen 

 \ Hydrogen 



' Oxygen 



Sulfur 



Chlorine 



Phosphorus 



Silicon. Fluorine 



Potassium 



Sodium 



Calcium 



Magnesium 



Iron 

 . Manganese 



f Carbon 

 Oxygen 



| Hydrogen 



\ Nitrogen 

 Sulfur (generally) 

 Phosphorus ( sometimes i 

 Iron (in a few cases) 



Carbon 

 Oxygen 

 Hydrogen 



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

 twentieth of .the plant, and never more than one-tenth 

 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. 

 AH plant substance, all animal tissue, foods and nearly 



*See note 2, p. 50, 



