CONTENTS. XV 



PAGE 



c. Relation of these phenomena to the interchange of 



substances in animals . . .217 



d. The nocturnal respiration of plants . .219 



e. The phenomenon of Rejuvenescence of the Cell in 



its relation to the periods of the day . . 321 



3. Reconstruction of the Cell, considered as a process of Rejuve- 

 nescence ..... 226 

 Kind and degree of Reconstruction : 



A. Reconstruction vfithout division of the cell . . 229 



B. With division into two Daughter-cells . . 232 

 (Different descriptions of this by Mohl, Unger, and Nageli) 233 



a. Division by gradual constriction (confirmed in Spi- 



rogyrd) . . . . .237 



b. Division vrith simultaneous (?) limitation over the 



whole plane of division . . . 247 



B*. Reconstruction with division into two cells, one remaining 



as an unchanged Mother-cell, the other cut off as a 



Daughter-cell (cell-formation by constriction). . 250 



c. Reconstruction with division into four Daughter-cells . 254 



Connection of this with halving . . .256 



D. Reconstruction vrith division into an indefinite number of 



Daughter-cells .... 259 



1. By division of contents filling the whole cavity of the 



cell . . . . .269 



2. By division of a layer of contents investing the wall of 



the Mother-cell (explained specially in Sydrodictyon) 261 

 Connecting case .... 271 



E. Partial Reconstruction through formation of Daughter-cells 



inthe contents of theindependentlysurvivingMother-ceU 272 



1. The Daughter-cells produced close upon the ceU-waU 272 



2. The Daughter-cells formed free in the contents . 274 



a. Formation of a free Daughter-cell around the pri- 



mary nucleus of the Mother-cell 



b. Formation of free Daughter-cells around secondary 



nuclei 



a. Formation of the germinal vesicles of the Pha- 



nerogamia 

 /3. Of the transitory cells in the embryo-sac 

 y. Of the endosperm cells 

 S. Gases of abnormal cell-formation . 

 4. Appendix, on the union of previously separate Cells (Con- 

 jugation) ..... 



275 



276 



276 

 278 

 278 

 281 



281 



