ism are tuned to one another, that is, _they are
adapted to one another_, and in the same way _the organism as a whole
is adapted to the conditions of its life, and it is so at every stage
of its evolution._

But all adaptations _can_ be referred to selection; the only point
that remains doubtful is whether they all _must_ be referred to it.

However that may be, whether the _Lamarckian principle_ is a factor
that has cooeperated with selection in evolution, or whether it is
altogether fallacious, the fact remains, that selection is the cause
of a great part of the phyletic evolution of organisms on our earth.
Those who agree with me in rejecting the _Lamarckian principle_ will
regard selection as the only _guiding_ factor in evolution, which
creates what is new out of the transmissible variations, by ordering
and arranging these, selecting them in relation to their number and
size, as the architect does his building-stones so that a particular
style must result.[55] But the building-stones themselves, the
variations, have their basis in the influences which cause variation
in those vital units which are handed on from one generation to
another, whether, taken together they form the _whole_ organism, as in
Bacteria and other low forms of life, or only a germ-substance, as in
unicellular and multicellular organisms.

FOOTNOTES:

[Footnote 33: _Vortraege ueber Descendenztheorie_, Jena, 1904, II. 269.
Eng. Transl. London, 1904, II. p. 317.]

[Footnote 34: See Poulton, _Essays on Evolution_, Oxford, 1908. pp.
xix-xxii.]

[Footnote 35: _Origin of Species_ (6th edit), pp. 176 _et seq._]

[Footnote 36: Chun, _Reise der Valdivia_, Leipzig, 1904.]

[Footnote 37: Plate, _Selektionsprinzip u. Probleme der Artbildung_
(3rd edit.), Leipzig, 1908.]

[Footnote 38: _Studien zur Descendenz-Theorie_ II., "Die Enstehung der
Zeichnung bei den Schmetterlings-raupen," Leipzig, 1876.]

[Footnote 39: _Origin of Species_ (6th edit.), p. 232.]

[Footnote 40: _Origin of Species_, p. 233; see also edit. 1, p. 242.]

[Footnote 41: _Ibid._ p. 230.]

[Footnote 42: _The Effect of External Influences upon Development_,
Romanes Lecture, Oxford, 1894.]

[Footnote 43: See Poulton, _Essays on Evolution_, 1908, pp. 316, 317.]

[Footnote 44: _The Evolution Theory_, London, 1904, I. p. 219.]

[Footnote 45: _Report of the British Association_ (Bristol, 1898),
London, 1899, pp. 906-909.]

[Footnote 46: _Proc. Ent. Soc._, London, May 6, 1903