nourished by warm
arterial blood--anywhere in the world a convolution of ganglionic
centres co-extensive with the psychic capacity of such a Soul" (!)

In other respects we will not deny that Du Bois-Reymond stands far
nearer to our recent evolution-theory than Virchow; nay, that from
year to year he has always pronounced more and more emphatically in
favour of the theory of descent as the one possible explanation of
morphological phenomena; indeed, Du Bois-Reymond has lately counted
himself as one of those naturalists who were convinced of the truth of
evolution even before Darwin! Then it is only to be wondered why so
acute and gifted an inquirer, who is certainly not lacking in
scientific ambition, left it to Charles Darwin to place the egg of
Columbus on the ring and to point out to biological science a new
method of unlimited capacity by giving the theory of descent a
definite and reliable basis!

It is clear from some remarks in his discourse bearing the title
"Darwin versus Galiani" (1876), that Du Bois-Reymond is still far
from understanding the full significance of transmutation as affording
a mechanical explanation of morphological problems. In this paper the
"History of Creation" is treated simply as a romance, and the
genealogies of phylogenesis are in his eyes "of about as much value as
the pedigrees of the Homeric heroes are in the eyes of historical
critics." Geologists may be extremely grateful for this estimate of
their science, for undoubtedly geology, as a structure of hypotheses,
is neither more nor less justifiable than phylogenesis, as I have
already pointed out in my Munich address: "Our phylogenetic hypotheses
may claim to have equal value with the universally-admitted hypotheses
of geology; the only difference is this, that the mighty structure of
hypotheses called geology is incomparably more complete, simpler, and
easier to grasp than that more youthful one called phylogenesis." But
as to the much-talked-of "genealogies," though they are nothing more
than the simplest, barest, and most superficial expression of the
hypotheses of phylogenesis, as provisional hypotheses they are just as
indispensable to specific phylogenesis as the theoretical
section-tables of the strata of the earth's crust are to geology.

If Du Bois-Reymond is so convinced of the truth of transmutation as he
has lately given himself out to be, why does not he make at least one
earnest attempt to test the interpreting pow