nimals caught
and kept _quite tame_ left loose and well fed about houses and living
many years. Hybrids produced almost as readily as pure breds. St Hilaire
great distinction of tame and domestic,--elephants,--ferrets{72}.
Reproductive organs not subject to disease in Zoological Garden.
Dissection and microscope show that hybrid is in exactly same condition
as another animal in the intervals of breeding season, or those animals
which taken wild and _not bred_ in domesticity, remain without breeding
their whole lives. It should be observed that so far from domesticity
being unfavourable in itself <it> makes more fertile: [when animal is
domesticated and breeds, productive power increased from more food and
selection of fertile races]. As far as animals go might be thought <an>
effect on their mind and a special case.

{65} The meaning is "That sterility is not universal is admitted by
all."

{66} See _Var. under Dom._, Ed. 2, i. p. 388, where the garden
forms of _Gladiolus_ and _Calceolaria_ are said to be derived from
crosses between distinct species. Herbert's hybrid _Crinums_ are
discussed in the _Origin_, Ed. i. p. 250, vi. p. 370. It is well
known that the author believed in a multiple origin of domestic
dogs.

{67} The argument from gradation in sterility is given in the
_Origin_, Ed. i. pp. 248, 255, vi. pp. 368, 375. In the _Origin_, I
have not come across the cases mentioned, viz. crocus, heath, or
grouse and fowl or peacock. For sterility between closely allied
species, see _Origin_, Ed. i. p. 257, vi. p. 377. In the present
essay the author does not distinguish between fertility between
species and the fertility of the hybrid offspring, a point on which
he insists in the _Origin_, Ed. i. p. 245, vi. p. 365.

{68} Ackermann (_Ber. d. Vereins f. Naturkunde zu Kassel_, 1898, p.
23) quotes from Gloger that a cross has been effected between a
domestic hen and a _Tetrao tetrix_; the offspring died when three
days old.

{69} No doubt the sexual cells are meant. I do not know on what
evidence it is stated that the mule has bred.

{70} The sentence is all but illegible. I think that the author
refers to forms usually ranked as varieties having been marked as
species when it was found that they were sterile together. See the
case of the red and blue _Anagallis_ given from Gaertner in t