198 



FIRST YEAR SCIENCE 



the protoplasm itself is able to increase and form new cells 

 as well as other substances, such as woody tissue and oils 

 and resins. In forming these substances the plant uses 

 oxygen just as animals do. If air is kept from the roots 

 of certain plants, as was seen in Experiment 94, the plants 

 cannot live. 



A FOREST OF PINES. 

 From the sap of these, turpentine and resin are made. 



These food substances which plants make by using the 

 energy supplied by the sun are the bases of all plant and 

 animal life. The sun's energy stored up in the green leaf 

 is the source of all plant and animal energy. If it were 

 not for the leaf manufactory run by the sun's power, life, 

 as we know it, would cease. Even white plants, -like the 

 mushroom, must live on the food manufactured by the 

 chlorophyll of the green plants. 



