not be much disturbed. But I quite agree with you, that in time they ought
to undergo some. In Bermuda and Madeira they have, as I believe, been kept
constant by the frequent arrival, and the crossing with unaltered
immigrants of the same species from the mainland. In Bermuda this can be
proved, in Madeira highly probable, as shown me by letters from E.V.
Harcourt. Moreover, there are ample grounds for believing that the crossed
offspring of the new immigrants (fresh blood as breeders would say), and
old colonists of the same species would be extra vigorous, and would be the
most likely to survive; thus the effects of such crossing in keeping the
old colonists unaltered would be much aided.

ON GALAPAGOS PRODUCTIONS HAVING AMERICAN TYPE ON VIEW OF CREATION.

I cannot agree with you, that species if created to struggle with American
forms, would have to be created on the American type. Facts point
diametrically the other way. Look at the unbroken and untilled ground in
La Plata, COVERED with European products, which have no near affinity to
the indigenous products. They are not American types which conquer the
aborigines. So in every island throughout the world. Alph. De Candolle's
results (though he does not see its full importance), that thoroughly well
naturalised [plants] are in general very different from the aborigines
(belonging in large proportion of cases to non-indigenous genera) is most
important always to bear in mind. Once for all, I am sure, you will
understand that I thus write dogmatically for brevity sake.

ON THE CONTINUED CREATION Of MONADS.

This doctrine is superfluous (and groundless) on the theory of Natural
Selection, which implies no NECESSARY tendency to progression. A monad, if
no deviation in its structure profitable to it under its EXCESSIVELY SIMPLE