66 The Vegetable Individual in iis relation to Species. 
f animals, a twofold reproduction appears in plants: sexual and 
non-sexual. Disregarding for the present the various relations of 
alternation of generation among the Cryptogamia, we find sexnal 
reproduction (in animals by fertilized ova,—in plants by fertil- 
ized seeds) always vested in the generation which concludes the 
cycle of generations. That the consideration of this generation — 
as the concluding one is not arbitrary, is shown by compariig it 
with the usual course of the metamorphosis; for the concluding 
generotion: is invested with the concluding formations of the met- 
amorphosis (flower and fruit), in the same way in fact as in the 
animal fe complete development of the organs of generation 
occurs at the summit of the individual metamorphosis. "The Bees 
ceding Leceyadanee ) generations, which Steenstrup calls “ nurses, 
on the contrary invariably produce their brood by non- -sextial re- 
ak ep in the animal Sains this takes place, now throngh 
germ-granules which develop in the interior of the body (as 
the nurses of Distomz), now by a process of division in the pos- — 
terior part of the body (the nurse of the Meduse, the Tapeworm 
or finally by external, persistent or deciduous, shoot-formations, 
oryne, Campanularia, Sertularie, etc.). Among Phauero- 
gamia the last is the only kind occurring subservient to allerna- 
tions of generation. 
In animals, as in plants, the number of the generations in 
which the cycle of alternation of generation is completed, is for 
the most part a determinate one. Tales Salpe, Coryne, Tu- 
bularie conclude this cycle in the second generation ; accor 
to Steenstrup’s showing, Distoma pacificum has a trimembral al- 
ternation of generation, and the family stock of Pennatula seems 
also to be ormed by a trimembral succession of shoots. Cam- 
se 
a 
first generations are of the same character. Among Sertulari@ 
cycles of still more numerous members appear to occur; eight 
to ten generations form the annual cycle of generation of Aphides, 
though, excepting the << one, they are all similar and not even 
determinate as to num 
o these examples from the animal ‘ee 
gdom much more nu- 
merous ones prom th the ep aeeble kingdom might be added, though © 
to in the Lerons de Botas but the  aatoption’ between determinate and indeiae 
minate growth, hag es n known since Josehin Jigs time, and was 
forward especially by Reeper and pitied by to classifying. wire 
- ee in that place, by ereeping stems, Sioa i oot-stocks, ng by bulbs ; and 
e rmi ; 
in plants, i . “sei concluding Fe remarks in 
book, “U: : ber das V : in der Natur 
ea 0 hermnaphroditinas | in Nar though in an gag different. manner 
mine as here given, for he com es the. ers with the individ- 
pry ade knee de eee me ee bit sok which I have already 
expressed my “= in the ne 
