“Thus, on the view which I hold, the natural system is genealogical in its arrangement, like a pedigree” (p. 422).
“On the view which I hold” was cut out in 1872.
Again:—
“We may feel almost sure, on the theory of descent, that these characters have been inherited from a common ancestor” (p. 426).
Again:—
“On my view of characters being of real importance for classification only in so far as they reveal descent, we can clearly understand,” &c. (p. 427).
“On my view” became “on the view” in 1872.
Again:—
“The more aberrant any form is, the greater must be the number of connecting forms which, on my theory, have been exterminated and utterly lost” (p. 429).
The words “on my theory” were excised in 1869.