Xll CONTENTS 



PAGE 



and Inner Walls of the Epidermis. The Cell Contents 

 of the Epidermis. Outgrowths and Excretions of the 

 Epidermis. The Multiple Epidermis. The Cork. 

 Cork as- a Protective Tissue. Cork as a Waterproof 

 Covering. Use of Cork in Healing Wounds. Other 

 Means of Protection. Illustrative Studies 61-74 



CHAPTER V 

 THE PLANT SKELETON 



The Making of the Skeleton. The Tissues of the Skeleton. 

 The Collenchyma. The Bast Fibers. The Wood 

 Fibers. The Stone Cells. Topography of the Skeleton. 

 Illustrative Studies 75^89 



CHAPTER VI 



THE ABSORPTION OF WATER AND MINERALS 



Roots in the Soil. The Root Hairs. Method of Intake of 

 Water and Solutes. Effect of Temperature of Soil, and 

 Character and Amount of Solutes upon Absorption. 

 Absorption of Water and Solutes by Aerophytes. 

 Illustrative Studies go-ioo 



CHAPTER VII 

 TRANSPORT OF WATER AND SOIL SOLUTES 



The Need of a Transporting System. Tissues Devoted to 

 the Transport of Water. The Tracheal Tubes. 

 Course of Tracheal Tubes through the Stem. The 

 Tracheids. Relation of the Tracheal Tissues to the 

 Medullary Rays and Wood Parenchyma. The Ring of 

 Annual Growth. Relation of Rings of Growth to 

 Growth in Length. Relation of Annual Rings to the 

 Leaves. Distribution of Water and Solutes throughout 

 the Leaf. --The Power Concerned in the Ascent of 



