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INTRODUCTION. When on board H. M. S. 1 Beagle ' as naturalist, I was much
struck with certain facts in the distribution of the inhabitants of South America, and
in the geological relations of the present to the past inhabitants of that continent.
How many of those birds and insects in North America and Europe, which differ
very slightly from each other, have been ranked by one eminent naturalist as
undoubted species, and by another as varieties, or, as they are often called, ...
... which have run wild in several parts of the world : if the statements of the rate of
increase of slow-breeding cattle and horses in South America, and latterly in
Australia, had not been well authenticated, they would have been quite
This subject has been ably treated by several authors, and I shall, in my future
work, discuss some of the checks at considerable length, more especially in
regard to the feral animals of South America. Here I will make only a few remarks,
... or beasts of prey) were to increase in Paraguay, the flies would decrease —
then cattle and horses would become feral, and this would certainly greatly alter (
as indeed I have observed in parts of South America) the vegetation : 70 (Chip.
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