LESSON FOUR 
PLANTS AND ANIMALS 
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15. 
Note to the Teacher.—The relationship of soils, plants 
and animals is quite well illuminated in this lesson. The 
substances composing plants and animals are defined, the 
sources of their formation pointed out, and the work that 
each performs is indicated, so that a clear idea may be 
had concerning food and its ultimate end when admitted 
as digested nutrients into the animal machine. This les- 
son informs us how this living machine operates and per- 
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How plants grow. 
Cells. 
Formation of plant compounds. 
Starch. 
Protein, 
Fat or oil. 
Ash or mineral material. 
Water. 
Crude fiber. 
. Groups of plant constituents. 
. Plants and animals compared. 
. Function of protein. 
. Heat and energy. 
What the fat does. 
What the carbohydrates do. 
forms its important work. 
