REJUVENESCENCE IN NATURE. 321 



of the formations to the starting point,* so must the 

 last-examined deviations from the usual mode of transition 

 to new organic destinations, belonging ordinarily to the 

 cycle of development of the species, not of the individual, 

 point to the common characters, which connect the tran- 

 sition from individual to individual, with the transition 

 from one structure to another within the individual 

 organism of the plant. 



In the Introduction we endeavoured to seize the points 

 common to these two domains, as the process si Rejuvenes- 

 cence, and the minute investigation of the phenomena of 

 Rejuvenescence in the course of life of plants, carried out 

 in the three main sections of our reflections, enable us now 

 the more readily to examine from the same point of view 

 the Rejuvenescences of the species through reproduction. 

 The transition to the new individual finds its analogue 

 within the species, in Cell-formation, as the freest modi- 

 fication of it, as we have seen especially in the formation 

 of the germ-cells (germinal vesicles) of the Phanerogamia ; 

 it finds its analogue, further, in Sprout-formation, here 

 again representing the most independent modification of 

 it ; for while the sprouts belonging to the cycle of deve- 

 lopment of the " stock" are unfolded, either in permanent 

 combination with the mother-stock, or if they separate 

 from it, are connected with it in the earliest period of 

 development, yet the embryo, as primary sprout of a new 

 vegetable t: stock," is always free from its earliest forma- 

 tion. As in the various gradations of the interlinking 

 (Gliedernng], which the vegetable stock acquires through 

 its Rejuvenescences in Cell-formation, Leaf-formation, and ' 

 Sprout-formation, we could not avoid recognising sub- 

 ordinate kinds of reproduction, since we could not deny 

 even to the cell, but especially to the sprout, a certain 

 individual import ; so, on the other hand, the series of 

 individuals produced by true reproduction appears as an 



* As in the cases of flowers appearing green, (anthochloroses,) in which 

 all parts of the flower often return more or less perfectly into the euphyllary 

 formation. 



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