/ 



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. — rCork 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 \T 



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 90-100 



CHAPTER VII 



Tr.\nsport 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 



