207.] [Footnote 54: Low's _Domesticated Animals of Great Britain_, Introduction, p.

lxiv.] [Footnote 55: Low's _Domesticated Animals_, p.

28.] [Footnote 56: _Amaryllidaceae_, by the Hon.

and Rev.William Herbert, p.
379.] [Footnote 57: _Origin of Species_, p.

239.] [Footnote 58: _Origin of Species_, sixth edition, p.