selective influence in favour of that organism, tending to its increase
and multiplication, while any change in the direction of (B) will
exercise a selective influence against that organism, tending to its
decrease and extinction.

Or, on the other hand, conditions remaining the same, let a given
organism vary (and no one doubts that they do vary) in two directions:
into one form (a) better fitted to cope with these conditions than the
original stock, and a second (b) less well adapted to them. Then it is
no less certain that the conditions in question must exercise a
selective influence in favour of (a) and against ( b), so that (a) will
tend to predominance, and (b) to extirpation.

That M. Flourens should be unable to perceive the logical necessity of
these simple arguments, which lie at the foundation of all Mr. Darwin's
reasoning; that he should confound an irrefragable deduction from the
observed relations of organisms to the conditions which lie around
them, with a metaphysical "forme substantielle," or a chimerical
personification of the powers of Nature, would be incredible, were it
not that other passages of his work leave no room for doubt upon the
subject.

"On imagine une 'election naturelle' que, pour plus de menagement, on me
dit etre inconsciente, sans s'apercevoir que le contre-sens litteral
est precisement la: 'election inconsciente'." (P. 52.)

"J'ai deja dit ce qu'il faut penser de 'l'election naturelle'. Ou
'l'election naturelle' n'est rien, ou c'est la nature: mais la nature
douee 'd'election', mais la nature personnifiee: derniere erreur du
dernier siecle: Le xixe fait plus de personnifications." (P. 53.)