Publisher's Synopsis
Excerpt from The Calcutta Review, 1865, Vol. 41
Now - in whatever measure these divisions hold good with regard to mammals, we cannot but help thinking that they are decidedly arbitrary with regard to birds. Our Opinion is this -that as the ?ora of a place is dependent on the tempera ture, and the insects dependent on the ?ora, so the birds, by being to a great extent dependent on insect food, are to be found to range according to the vegetation.
In the low valleys of the Himalayas, where heat and moisture combine to form a very tropical vegetation, we find the very finest forms Of insects are developed, and those birds frequenting the same region are generally nearly allied, as well as the insects, to the tropical forms found further south in the Islands of the Indian Archipelago, where the vegetation is Of much the same character. The higher up the mountain sides we go, we find the birds and insects vary according to the zones of vegetation.
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