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FOOTNOTES:
[Footnote 4: _Geographic Botanique_, p. 798.]
[Footnote 5: _The Origin of Species_, p. 53.]
[Footnote 6: _The Earth as Modified by Human Action_, p. 51.]
[Footnote 7: _The Origin of Species_, p. 56.]
[Footnote 8: See _Nature_, vol. xxxi. p. 63.]
[Footnote 9: _A Visit to South America_, 1878; also _Nature_, vol. xxxi.
pp. 263-339.]
[Footnote 10: Still more remarkable is the increase of rabbits both in
New Zealand and Australia. No less than seven millions of rabbit-skins
have been exported from the former country in a single year, their value
being L67,000. In both countries, sheep-runs have been greatly
deteriorated in value by the abundance of rabbits, which destroy the
herbage; and in some cases they have had to be abandoned altogether.]
[Footnote 11: Later observers have proved that two eggs are laid and
usually two young produced, but it may be that in most cases only one of
these comes to maturity.]
[Footnote 12: _Origin of Species_, p. 59. Professor A. Newton, however,
informs me that these species do not interfere with one another in the
way here stated.


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