ge and that advantage
(whatever it may be, intellect, &c., &c., or some particular structure
or constitution) is inherited{140}, A will be the progenitor of several
genera or even families in the hard struggle of nature. A will go on
beating out other forms, it might come that A would people earth,--we
may now not have one descendant on our globe of the one or several
original creations{141}. External conditions air, earth, water being
same{142} on globe, and the communication not being perfect, organisms
of widely different descent might become adapted to the same end and
then we should have cases of analogy{143}, [they might even tend to
become numerically representative]. From this often happening each of
the great divisions of nature would have their representative eminently
adapted to earth, to <air>{144}, to water, and to these in <illegible>
and then these great divisions would show numerical relations in their
classification.

{135} After "organs" is inserted, apparently as an
afterthought:--"no, and instance metamorphosis, afterwards
explicable."

{136} For analogical resemblances see _Origin_, Ed. i. p. 427, vi.
p. 582.

{137} "Practically when naturalists are at work, they do not
trouble themselves about the physiological value of the
characters.... If they find a character nearly uniform, ... they
use it as one of high value," _Origin_, Ed. i. p. 417, vi. p. 573.

{138} "We are cautioned ... not to class two varieties of the
pine-apple together, merely because their fruit, though the most
important part, happens to be nearly identical," _Origin_, Ed. i.
p. 423, vi. p. 579.

{139} The whole of this passage is obscure, but the text is quite
clear, except for one illegible word.

{140} <The exact position of the following passage is uncertain:>
"just as it is not likely every present breed of fancy birds
and cattle will propagate, only some of the best."

{141} This suggests that the author was not far from the principle
of divergence on which he afterwards laid so much stress. See
_Origin_, Ed. i. p. 111, vi. p. 134, also _Life and Letters_, i. p.
84.

{142} That is to say the same conditions occurring in different
parts of the globe.

{143} The position of the following is uncertain, "greyhound and
racehorse have an analogy to each other." The same comparison
occu