Decline of Growth and the Best Period. Ill 



conditions by the appearance of the plant, and in know- 

 ing how to correct them. We will, therefore, next con- 

 sider the plant as affected by unfavorable conditions of 

 environment. 



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; Plant Physiology, Duggar. 



