404 LEAVES. 



Q. Why are the LEAYES of plants GREEN ? 



A. Because the carbon of the leaves 

 is a bluish olive, and the sap and tissue 

 of the cells, YELLOW ; when, therefore, 

 the yellow sap flows into the blue carbon, 

 it produces a green leaf. 



Q. Why are leaves a LIGHT green in SPRING ? 



A. Because the young leaves of 

 spring have more sap than carbon ; and, 

 therefore, the yellow of the green prevails. 



Q. Why are leaves a YELLOWISH BROWN in 

 AUTUMN ? 



A. Because the carbon of the leaves 

 is dying away, and the yellow tinge of 

 the tissue and falling sap prevails over 

 the blue. 



Q. Why are plants a PALE YELLOW when 

 kept in the DARK ? 



A. Solar light is essential for the 

 production of carbon ; and as plants kept 

 in the dark lose their carbon, they lose 

 the blue colour which should convert 

 their yellow sap to green. 



Q. Why are POTATOES YELLOW ? 



A. Potatoes are grown underground, 

 and, therefore, contain very little carbon 



