Page:An account of a voyage to establish a colony at Port Philip in Bass's Strait.djvu/60

( 35 ) of oil. The copious vapours exhaled from the earth and sea, in tropical climates, may produce this effect, which is found to decrease as we recede from the equator, either north or south.

In latitude 6&deg; North, we lost the N. E. trade-wind, and for a few days experienced the usual equinoctial calms, and squalls, with heavy rains, and strong easterly currents. The line was crossed in the longitude of 25° W., with the usualgustine