some ancestor of the horses, these splints would be found to be
complete digits, has been verified, we are furnished with very strong
reasons for looking for a no less complete verification of the
expectation that the three-toed Plagiolophus-like "avus" of the horse
must have been a five-toed "atavus" at some early period.

[Six years afterwards, this forecast of paleontological research was
to be fulfilled, but at the expense of the European ancestry of the
horse. A series of ancestors, similar to these European fossils, but
still more equine, and extending in unbroken order much farther back
in geological time, was discovered in America. His use of this in his
New York lectures as demonstrative evidence of evolution, and the
immediate fulfilment of a further prophecy of his will be told in due
course.

His address to the Cambridge Y.M.C.A, "A Commentary on Descartes'
'Discourse touching the method of using reason rightly, and of seeking
scientific truth,'" was delivered on March 24. This was an attempt to
give this distinctively Christian audience some vision of the world of
science and philosophy, which is neither Christian nor Unchristian,
but Extra-christian, and to show] "by what methods the dwellers
therein try to distinguish truth from falsehood, in regard to some of
the deepest and most difficult problems that beset humanity, "in order
to be clear about their actions, and to walk sure-footedly in this
life," as Descartes says. For Descartes had laid the foundation of his
own guiding principle of "active scepticism, which strives to conquer
itself."

[Here again, as in the "Physical Basis of Life," but with more detail,
he explains how far materialism is legitimate, is, in fact, a sort of