... of tho same continent — Centres of creation — Means of dispersal, by changes
of climate and of the level of the land, and by occasional means— Dispersal
during the Glacial period co-extensive with the world 802 CHAPTER XII.
But when we compare the dray- horse and race-horse, the dromedary and camel,
the various breeds of sheep fitted either for cultivated land or mountain pasture,
with the wool of one breed good for one purpose, and that of another breed for ...
In this respect enclosure of the land plays a part. Wandering savages or the
inhabitants of open plains rarely possess more than one breed of the same
species. Pigeons can be mated for life, and this is a great convenience to the
They may whilst in this incipient state become extinct, or they may endure as
varieties for very long periods, as has been shown to be the case by Mr.
Wollaston with the varieties of certain fossil land-shells in Madeira. If a variety
were to flourish ...
Here we see how potent has been the effect of the introduction of a single tree,
nothing whatever else having been done, with the exception that the land had
been enclosed, so that cattle could not enter. But how important an element ...
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