The monsoons of India, as I shall presently show, are examples of this; but the most striking instance with which I am personally acquainted occurs in the Pacific Ocean, between the Bay of Panama and the Peninsula of California, from latitude 8 deg.

to 22 deg.north.If the huge continent of Mexico were taken away, and only sea left in its place, there can be no doubt but the ordinary phenomena of the Trade-winds would be observable in that part of the Pacific above mentioned.

Cool air would then be drawn from the slow moving parallels lying to the northward, towards the swift moving latitudes, near the equator, in order to supply the place of the rarefied air removed to the higher regions of the atmosphere, and, of course, north-easterly breezes would be produced.

But when the sun comes over Mexico, that vast district of country is made to act the part of an enormous heater, and becomes a far more powerful cause of rarefaction to the superincumbent air than the ocean which lies between it and the equator.

Accordingly, the air over Mexico, between the latitudes of 10 deg.