Chapter II

THE MEANS OF DISPERSAL AND THE MIGRATIONS OF ANIMALS.

Means of Dispersal of Mammalia (p. 10)--Climate as a Limit to the Range
of Mammals (p. 11)--Valleys and Rivers as Barriers to Mammals (p. 12)--
Arms of the Sea as Barriers to Mammals (p. 13)--Ice-floes and drift-wood
as aiding the Dispersal of Mammals (p. 14)--Means of Dispersal of Birds
(p. 15)--Dispersal of Birds by Winds (p. 16)--Barriers to the Dispersal
of Birds (p. 17)--The Phenomena of Migration (p. 18)--Migrations of Birds
(p. 19)--General remarks on Migration (p. 25)--Means of Dispersal of
Reptiles and Amphibia (p. 28)--Means of Dispersal of Fishes (p. 29)--
Means of Dispersal of Mollusca (p. 30)--Means of Dispersal of Insects and
the Barriers which limit their Range (p. 32) 10-34