This they at once obtain by acquiring a
resemblance to other species which, from whatever cause, enjoy a
comparative immunity from persecution."
[55] This no doubt refers to Janet's "Materialisme Contemporain."
[56] _Quarterly Journal of Science_, January 7, 1867. "Ice Marks in
North Wales," by A.R. Wallace.
[57] I.e., the suggestion that conspicuous caterpillars or perfect
insects (e.g. white butterflies) which are distasteful to birds are
protected by being easily recognised and avoided.
[58] A bearded woman having an irregular double set of teeth. See
"Animals and Plants," ii. 328.
[59] The letter to which this is a reply is missing. It evidently refers
to Wallace's belief in the paramount importance of protection in the
evolution of colour. _See also_ Darwin's letter of February 26, 1867.
[60] _Menura superba._ See "The Descent of Man" (1901), p. 687.
Rhynchaea, mentioned on p. 184, is discussed in the "Descent," p. 727.
The female is more brightly coloured than the male and has a convoluted
trachea, elsewhere a masculine character. There seems some reason to
suppose that "the male undertakes the duty of incubation.
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