Botany and Zoology. 443 
—— successio continuata generatione renascentium.” The funda- 
mental idea of species, we would still maintain, is that of a chain, of 
which genetically- -connected individuals are the links. That, in the 
practical recognition of species, the essential characteristic has t 
inferred, is no great objection,—the general fact that like ccaenionn like 
mption being that of the uniformity of nature. The idea of gravita- 
ies, that of the atomic constitution of matter, and the like, equally have 
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as come in which we may accept, with DeCandolle, their successive 
origination, at the cain a: of the prement era or before, and even 
by derivation from other forms, then the ‘in principio’ of Linnans will 
refer to that time, whenever it was, and his proposition be as sound and 
Wise as ever. 
n his Géographie yest (ii, 1068-1077) DeCandolle Wipe 15 
this: subject at length, and in the same interest. Remarking that of the 
two great facts of species, viz: likeness among the individuals, an 
alogical connection, zoologists have yenerally preferred the latter,’ while 
botanists have been divided in opinion, he pronounces _ _ former as 
essential thing, in the following argumentative statem 
ant a — jai été Bet ah — ma ens as de Tepe a mettre dé- 
dissent la ressemblanc s desc ession. Ce n’est 
pas seul fcthin a cau a "cieonst es propres au sagen vé , dont je 
m’occupe exclusivement n’est pas non plus afin de sortir wget définition des 
théories et de Ja rendre le on possible utile aux naturalistes ipteurs et 
A ‘un motif philosophique. En toute ag il faut 
aller au fo. s questions, quand on le peut. Or, pourquoi la reproduction 
ntes. Si lon obtient des cro somaniaict c’est que les ao a analogues ; 
Si ces croisements donnent des produits féconds, c’est que les individus étaient 
lus ianbarces si ces produits eux-mémes sont féconds, c’est que la ressem- 
@ ressemblance est le fond; la reproduction en est seulement la manifestation 
et la mesure, et il est logique de placer la cause au-dessus de l’effet.” 
We are not at all convinced. We still hold that genealogical connec- 
tion, rather than mutual resemblance is the fundamental thi tgs Bg 
P oo citing Fiourene' t Mie te ang n'est qu’ ~~ condition second- 
aire; la condition essentielle est la descendance: ce n'est pas la ressemblance, c'est 
la succession i ios ubviden, qui fait l’espéce.” 
