Decline of Growth and the Best Period. 117 



The following books are recommended for reading in 

 connection with the preceding chapter: How Plants 

 Grow, Gray; Lessons in Botany, Gray; Botanical Text- 

 Book, Gray; A Treatise on the Physiology of Plants, 

 Sorauer; The Soil, King; The Fertility of the Land, 

 Roberts. 



