The celebrated geologist and naturalist, Von Buch, in his excellent ‹Description Physique des Isles Canaries› (1836, p. 147), clearly expresses his belief that varieties slowly become changed into permanent species, which are no longer capable of intercrossing.
Rafinesque, in his ‹New Flora of North America›, published in 1836, wrote (p. 6) as follows: — “All species might have been varieties once, and many varieties are gradually becoming species by assuming constant and peculiar characters”; but farther on (p. 18) he adds, “except the original types or ancestors of the genus”.
In 1843-44 Professor Haldeman (‹Boston Journal of Nat. Hist. U. States›, vol. iv. p. 468) has ably given the arguments for and against the hypothesis of the development and modification of species: he seems to lean towards the side of change.
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[] C h. D a r w i n, ‹T h e O r i g i n o f S p e c i e s›, J o h n M u r r a y, 1 8 7 2⁶.
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