[163]

(163

Ch. V.

of the same species. And this is the same as saying the statement admitting stating stating that a character which is generally of generic value, when it sinks in value & becomes, only of specific character, value,  it often it also becomes variable.

 

[there are two sets of pin holes where a large note was attached to the blank section here. The Origin has the following text in this gap in the draft:
"though its physiological importance may remain the same. Something of the same kind applies to monstrosities: at least Is. Geoffroy St. Hilaire seems to entertain no doubt, that the more an organ normally differs in the different species of the same group, the more subject it is to individual anomalies."]

 

(On the ordinary view of each a species having been independently created, why should such parts of its structure, which differ from the same part in other independently created species, be more variable, than those parts which are closely alike in several species? I do not see that any explanation can be given. But on our view of species being only strongly marked & fixed varieties; become permanen we might surely expect often to find them still often varying in those parts of their structure, which from having varied have varied, only & thus come in some greater more strongly degree marked to differ. & less fluctuating manner, had raised them have come to be to the rank of species. Or , to state the case differently ; — the points in which all the species of a genus resemble each other & in which they differ from the species of some other groups genus, are called generic characters; & these characters in common we may attribute on our view to inheritance

 

[Origin of species, p. 155 with text identical to the draft in bold:
And this fact shows that a character, which is generally of generic value, when it sinks in value and becomes only of specific value, often becomes variable, [...]
On the ordinary view of each species having been independently created, why should that part of the structure, which differs from the same part in other independently-created species of the same genus, be more variable than those parts which are closely alike in the several species? I do not see that any explanation can be given. But on the view of species being only strongly marked and fixed varieties, we might surely expect to find them still often continuing to vary in those parts of their structure which have varied within a moderately recent period, and which have thus come to differ. Or to state the case in another manner:—the points in which all the species of a genus resemble each other, and in which they differ from the species of some other genus, are called generic characters; and these characters in common I attribute to inheritance

[163v]

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