Which preposition to use with tropical

in Occurrences 6%

The negroes at their work, and their black picaninnies rolling about on the ground, seemed an appropriate part of the landscape, so tropical in its beauty of dark colors and luxuriant growth.

on Occurrences 1%

The wide range in both vegetable and animal life over this area is one of its chief distinguishing characteristics, partaking of the semi-tropical on the one hand, with a low winter temperature on the other, but traversing neither range so far as to prove directly destructive in its effects.

through Occurrences 1%

In another climate the mountains would present a gradation of vegetable growth, from the tropical through the temperate to the northern zone.

to Occurrences 1%

It is when Mr. Wedgwood would reverse the order of Nature, and proceed from the tropical to the direct and simple, that we are at issue with him.

Which preposition to use with  tropical