Origin of Species Variorum

↑ 1 blocks not present in 1869 1872; present in 1859 1860 1861 1866

Moreover, on the view of the origin of genera which I shall presently give, we have no right to expect often to meet with generic differences in our domesticated productions.

→ of the same species, 1859 1860 1861 1866 1869

OMIT 1872

→ strongly marked races in some 1869

some 1860 1861 1866

strongly marked races of some 1872

→ are 1869 1872

the breeds have 1860 1861 1866

all such

valuations

valua- tions

being at present empirical. When it is explained how genera originate under nature, it will be seen that we have no right to expect often to find a generic amount of difference in our domesticated races. ↑

When we

attempt

attempting

to estimate the amount of structural difference between

allied

the

domestic

races,

races

→of the same species, we are soon involved in doubt, from not knowing whether they

are

have

descended from one or several

parent species.

parent-species.

This point, if it could be cleared up, would be interesting; if, for instance, it could be shown that the

grey- hound,

greyhound,

bloodhound, terrier, spaniel, and bull-dog, which we all know propagate their kind

truly, were the offspring of any single species, then such facts would have great weight in making us doubt about the immutability of the many

~~very~~

very

closely allied

and

....

natural species — for instance, of the many foxes — inhabiting different quarters of the world. I do not believe, as we shall presently see, that the whole amount of difference between the several breeds of the dog has been produced under domestication; I believe that some small part of the difference is due to their

being

having

descended from distinct species. In the case of →strongly marked races in some other domesticated species, there is

presumptive

presumptive,

or even strong evidence, that all →are descended from a single wild stock.

It has often been assumed that man has chosen for domestication animals and plants having an extraordinary inherent tendency to vary, and likewise to withstand diverse climates. I do not dispute that these capacities have added largely to the value of most of our domesticated productions; but how could a savage possibly know, when he first tamed an animal, whether it would vary in succeeding generations, and whether it would endure other climates? Has the little variability of the ass

or guinea-fowl,

and goose,

or the small power of endurance