CONTENTS 



CHAPTER /^ PAGE 



Geneual Principles ... ... ... ... 1 



II. The Pkincxple of Ncmbeb ... ... ... 7 



ni. The Principle of Number — Continued ... ... 25 



IV. The Principle of Arrangement ... ... 39 



Y. The Principle of Cohesion ... ... ... 48 



VI. The Principle of Cohesion— Con^mwed ... 54 



VII. The Principle of Cohesion —Coji^iwwed ... ... 62 



VIII. The Principle of Adhesion ... ... ... 78 



IX. The Cause of Unions ... ... ... ... 84 



X. The Receptacular Tube ... ... ... 89 



XL The Forms of Floral Organs ... ... ... 101 



XII. The Origin of " Zygomorphism " ... ... 116 



Xm. The Effects of Strains on Structures ... ... 123 



XIV. Acquired Eegularity and "Peloria" ... 128 



XV. The Origin of Floral Appendages ... ... 133 



XVI. Secretive Tissues ... ... ... ... 140 



XVII. Sensitiveness and Irritability of Plant Organs ... 151 



XVIII. Origin of Conducting Tissues ... ... 164 



