***
[footnote] *Schleiden, 'Ueber die Entwicklungsweise der Pflanzenzellen', in
Muller's 'Archiv fur Anatomie und Physiologie', 1838, s. 137-176; also his
'Grundzuge der wissenschaftlichen Botanik', th. i., s. 191, and th. ii., s
11. Schwann, 'Mikroscopische Untersucungen uber die Uebereinstimmung in der
Struktur und dem Wachsthum der Thiere und Pflanzen', 1839, s. 45, 220.
Compare also, on similar propagation, Joh. Muller 'Physiologie des
Menschen', 1840, th. ii., s. 614.
[footnote] **Schleiden, 'Grundzuge der wissenschaftlichen Botanik', 1842,
th. i., s. 192-197.
[footnote] ***[On cellular formation, see Henfrey's 'Outlines of Structural
and Physiological Botany', op. cit., p. 16-22.] -- Tr.
But in a work like the present we can venture on no more than an allusion to
the mysteries that involve the question of modes of origin; the geography of
animal and vegetable organisms must limit itself to the consideration of
germs already developed, of their haabitation and transplantation, either by
voluntary or involuntary migrations, their numerical relation, and their
distribution over the surface of the earth.
The general picture of nature which I have endeavored to delineate would be
incomplete if I did not venture to trace a few of the most marked features
of the human race, considered with reference to physical gradations -- to
the geographical distribution of contemporaneous types -- to the influence
exercised upon man by the forces of nature, and the reciprocal, although
weaker action which he in his turn exercises on these natural forces.
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