in the Royal Institution, March 24, 1876.]

[Footnote 134: "Antiquity of Man," 4th ed.]

[Footnote 135: Southall, _Op. cit._]

[Footnote 136: The Mentone skeleton described by Dr. Riviere gives
evidence of these facts.]

[Footnote 137: Mr. Pengelly declines to admit this; but assigns no cause
for the breaking up of portions of the old floor, which he merely refers
in general terms to "natural causes."]

[Footnote 138: This whole subject of supposed preglacial or interglacial
men is still in great confusion and uncertainty, and is complicated with
questions, still debated, as to the ages of the supposed glacial and
postglacial deposits.]

[Footnote 139: _Quarterly Journal of Science_, April, 1875.]

[Footnote 140: Lyell's "Manual of Elementary Geology."]

[Footnote 141: For a full discussion of this subject, see the "Story of
the Earth and Man."]

[Footnote 142: Such a table, with an admirable exposition of the entire
succession, as at present known, is given in the Appendix to Lyell's
"Students' Manual of Geology."]

[Footnote 143: Lyell, basing his calculations on the surveys of Messrs.
Humphreys and Abbott, but others give very different estimates.]

[Footnote 144: A perfectly parallel example is that of the growth of the
peninsula of Florida in the modern period, by the same processes now
adding to its shores; and this has afforded to Professor Agassiz a still
more extended measure of the Post-tertiary period.]

[Footnote 145: Reade, of Liverpool, has recently given a much slower
rate--one foot in 13,000 years--as a result of recent English surveys;
but I have not seen his precise data, and the result certainly differs
from those of all other observations.]

[Footnote 146: I am quite aware that it may be objected to all this that
it is based on merely negative evidence; but this is not strictly the
case. There are positive indications of these truths. For example, in
the Mesozoic epoch the lacertian reptiles presented huge elephantine
carnivorous and herbivorous species--the Megalosaurus, Iguanodon, etc.;
flying species, with hollow bones and ample wings--the Pterodactyles;
and aquatic whale-like species--Pliosaurus, Ichthyosaurus, etc. These
creatures actually filled the offices now occupied by the mammals; and,
though lacertian in their affinities, they must have had circulatory,
respiratory, and nervous systems far in advance of any modern reptiles
even of the order of Loricates.]

[Footnote 147: