e produce children with d^o.,--early
maturity,--longevity,--old men, brothers, of same disease--young
children of d^o. I said men do not select for quality of
young,--calf with big bullocks. Silk-worms, peculiarities which,
appear in caterpillar state or cocoon state, are transmitted to
corresponding states. The effect of this would be that if some
peculiarity was born in a young animal, but never exercised, it
might be inherited in young animal; but if exercised that part of
structure would be increased and would be inherited in
corresponding time of life after such training.

I have said that man selects in full-life, so would it be in
Nature. In struggle of existence, it matters nothing to a feline
animal, whether kitten eminently feline, as long as it sucks.
Therefore natural selection would act equally well on character
which was fully <developed> only in full age. Selection could tend
to alter no character in foetus, (except relation to mother) it would
alter less in young state (putting on one side larva condition) but
alter every part in full-grown condition. Look to a foetus and its
parent, and again after ages foetus and its <i. e. the above
mentioned parents> descendant; the parent more variable <?> than
foetus, which explains all.]

Thus there is no power to change the course of the arteries, as long as
they nourish the foetus; it is the selection of slight changes which
supervene at any time during <illegible> of life.

The less differences of foetus,--this has obvious meaning on this view:
otherwise how strange that a [monkey] horse, a man, a bat should at one
time of life have arteries, running in a manner, which is only
intelligibly useful in a fish! The natural system being on theory
genealogical, we can at once see, why foetus, retaining traces of the
ancestral form, is of the highest value in classification.

Sec. IX. <ABORTIVE ORGANS.>

There is another grand class of facts relating to what are called
abortive organs. These consist of organs which the same reasoning power
that shows us how beautifully these organs in some cases are adapted to
certain end, declares in other cases are absolutely useless. Thus teeth
in Rhinoceros{165}, whale, narwhal,--bone on tibia, muscles which do not
move,--little bone of wing of Apteryx,--bone representing extremities in
some snake,--little wings within <?> so