We wish to emphasize the fact that some types of maritime air, such as the South Pacific trade, though long in the equatorial regions, can remain quite dry and stable, not only while in such regions but also after leaving them for higher latitudes. It may well be that passage through a frontal zone, convergence from other causes such as Coriolis force or the pressure gradient surrounding continental heat lows, transit over warmer water surface, or even orographic effects may have much more to do with the wetness of some equatorial maritime air masses, like the true southwest monsoon of the Indian Ocean, than merely lengthy passage through the tropics aided only by local heat convection.

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