CONTENTS 



CHAPTER PAGE 



I. Ice 7 



II. The Origin of Soil - - - - u 



III. The Stem 17 



IV. Combustion 23 



V. Carbonic Acid Gas ... 2 g 



VI. Hollow Trees — The Age of Trees - 35 



VII. Respiration ----- 41 



VIII. Respiration (continued) - - - 47 



IX. The Root - - - 53 



X. The Soil 61 



XI. Shoots ... - 65 



XII. The Soil (continued) 69 



XIII. Adventitious Shoots - - - - 75 



XIV. Plants and the Atmosphere 81 

 XV. Bulbs and Suckers - - 87 



XVI. Potash and Phosphorus - - 93 



XVII. Tubers — Starch - - 99 



XVIII. Uses of Starch 103 



XIX. Phosphates and Nitrogen - - 107 



XX. The Ascent of the Sap - - - 115 



XXI. Lime .... - 121 



XXII. The Descent of the Sap - - 127 



