nd Darwin
says, at this stage they are at the same stage of development as
infants, between the ages of ten and twelve months, who understand many
words and sentences, but still cannot utter a single word. It is not the
mere articulation which is our distinguishing character; for parrots and
other birds possess the power. Nor is it the mere capacity of connecting
definite sounds with definite ideas; for it is certain that some
parrots, which have been taught to speak, connect unerringly words with
things, and persons with events." The lower animals, as has already been
stated, differ from man solely in his almost infinitely larger power of
associating together the most diversified sounds and ideas; and this
obviously depends on the high development of his mental powers.

We now come to the consideration of a very delicate subject--a subject
which is certainly at best very unsatisfactory to handle, as far as
popular sentiment is concerned; for, no matter how successfully it may
be handled, according to one class of thinkers, to another class of more
orthodox thinkers it would be entirely at fault. The subject is, _Man's
Moral Sense, Belief in God, Religion, Conscience, and Hope of
Immortality_.

It has been stated by some writers that where "faith commences science
ends." How erroneous is such a statement as this! for, as Krauth has
said, "The great body of scientific facts is actually the object of
knowledge to a few, and is supposed to be a part of the knowledge of the
many, only because the many have faith in the statements of the few,
though they can neither verify them, nor even understand the processes
by which they are reached."[62]

"We believe," says Lewes, "that the sensation of violet is produced by
the striking of the ethereal waves against the retina more than seven
hundred billions of times in a second. * * * These statements are
accepted _on trust_ by us who know that there are thinkers for whom they
are irresistible conclusions." It is evident that it is to faith that
science owes, to a very great extent, her progress and development; for
it is impossible for man to prove by experimental demonstration all the
facts of science, and since a certain number of facts have got to be
accepted before a new experiment can be attempted, he has to accept on
faith that such and such a statement is a fact, because such and such a
scientist has claimed to have demonstrated it. "We are not _responsible_
for the fact,