SUMMARY OF THE CONTENTS. 



PAGE 



PREFACE : Origin and object of the Treatise, with addenda to certain 



special parts . . . . . . ix 



INTRODUCTION : Reflections on the appearance and the essential Nature 

 of Rejuvenescence in general ; passing to the Phenomena of Reju- 

 venescence in Plants, more particularly, divided into three sections 1 



i. FORMATION OF SPROUTS as the means of Rejuvenescence of the 

 Vegetable stock . . . . .21 



1. Individual nature of the Sprouts . . .23 



2. Formation of sprouts as subordinate reproduction, and alter- 



nation of generations of the plant caused thereby . 24 



a. Origin of sprouts . . . .25 



b. Deficiencies of them . . . .28 



c. Complementary conditions . . .32 



d. Distinction of essential and inessential sprouts . 36 



e. Importance of the latter in reference to 



a Character . . 38 



/3 Economy of Vegetable life . . . .41 



/ Transitional cases . . . .43 



ii. LEAF-FORMATION, giving rise to the subdivisions of the Rejuvenes- 

 cence in the single sprout . . . .51 



1. Phenomena of Rejuvenescence in the sprout through retro- . 



gressive and vibratory course of the Metamorphosis . 52 



2. The ascending Metamorphosis considered in its risings and 



sinkings . ..60 



. Summary of the Leaf-formations . . 62 



b. Change of proportionate breadth of the base of the 



leaf in the different leaf-formations . .67 



c. The same in the longitudinal development of the leaf . 70 



d. Disappearance of leaf-formation in particular regions . 83 



3. The individual leaves as links of Rejuvenescence in the course 



of Metamorphosis . . . . 101 



