CONTENTS 



Page 

 Preface v 



PART I 



Mutilation and Regeneration 



Chapter 



I. Introduction 1 



II. General Remarks about the Material and the Experi- 

 ments 9 



III. Regeneration and Mass Relation in Isolated Leaves of 



Bryophyllum 12 



IV. The Inhibiting Action of the Rapidly Growing Notches 



ON the Other Notches of a Leaf 19 



V. The Influence of Gravity on the Formation of Roots and 



Shoots in a Detached Leaf of Bryophyllum 24 



VI. Why Does Separation of a Leaf from the Plant Induce 



THE Growth of Roots and Shoots in a Leaf? .... 29 

 VII. The Validity of the Mass Relation for Regeneration 



in a Defoliated Piece of Stem of Brrjophyllum calycinum . 42 

 VIII. The Role of the Inhibiting Effect of Rapidly Growing 



Parts in the Regeneration of the Stem 57 



PART II 



Polarity in Regeneration 



IX. The Influence of the Leaf on the Regeneration in the 



Stem 67 



X. The Influence of Gravity on the Polar Character of 



Regeneration in a Stem of Bryophyllum 73 



XI. The Influence of Gravity on the Polar Character of 



Regeneration in a Stem of Bryophyllum {Continued) . . 85 

 XII. The Inhibitory Action of Apical Leaves on the Formation 



of Shoots in the Lower Part of the Stem 93 



XIII. Callus Formation 109 



XIV. Inhibitory Effects of A Second Order BY AN Apical Leaf. 114 

 XV. The Inhibitory Effect of an Apical Leaf on Shoot Forma- 

 tion IN A Stem Suspended Horizontally 124 



XVI. The Growth of the Axillary Shoots 132 



XVII. Some Preliminary Experiments on the Path of the 

 Ascending and Descending Sap in the Stem of Bryophyl- 

 lum 137 



XVIII. The Formation of Flowers in Bryophyllum 140 



XIX. Concluding Remarks 141 



ix 



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