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Influence of fortuitous destruction on natural selection.
On the convergence of specific forms.
Account of the Ground-Woodpecker of La Plata modified.
On the modification of the eye.
Transitions through the acceleration or retardation of the
period of reproduction.
The account of the electric organ of fishes added to.
Analogical resemblance between the eyes of Cephalopods
and Vertebrates.
Claparède on the analogical resemblance of the hair-claspers
of the Acaridæ.
The probable use of the rattle to the Rattle-snake.
Helmholtz on the imperfection of the human eye.
The first part of this new chapter consists of portions, in a
much modified state, taken from chap. iv. of the former
editions. The latter and larger part is new, and relates
chiefly to the supposed incompetency of natural selection,
to account for the incipient stages of useful structures.
There is also a discussion on the causes which prevent
in many cases the acquisition through natural selection
of useful structures. Lastly, reasons are given for dis-
believing in great and sudden modifications. Gradations
of character, often accompanied by changes of function,
are likewise here incidentally considered.
The statement with respect to young cuckoos ejecting their
foster-brothers confirmed.
On the cuckoo-like habits of the Molothrus.
On fertile hybrid moths.
The discussion on the fertility of hybrids not having been ac-
quired through natural selection condensed and modified.
On the causes of sterility of hybrids, added to and corrected.
Pyrgoma found in the chalk.
Extinct forms serving to connect existing groups.
On earth adhering to the feet of migratory birds.
On the wide geographical range of a species of Galaxias,
a fresh-water fish.
Discussion on analogical resemblances, enlarged and modified.
Homological structure of the feet of certain marsupial
animals.
On serial homologies, corrected.
Mr. E. Ray Lankester on morphology.
On the asexual reproduction of Chironomus.-
On the origin of rudimentary parts, corrected.
Recapitulation on the sterility of hybrids, corrected.
Recapitulation on the absence of fossils beneath the Cam-
brian system, corrected.
Natural selection not the exclusive agency in the modi-
fication of species, as always maintained in this work.
The belief in the separate creation of species generally held
by naturalists, until a recent period.
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