and 6 deg.north.From June to November it is shifted back as far, sometimes, as 13 deg.

north, but it seldom extends as far south as 8 deg.north.Subjects which are treated of in a series of tables showing the equatorial limits of both Trade-winds, deduced by the late Captain James Horsburgh, hydrographer of the East India Company, from the observations of 238 ships.

These tables show very clearly the effect of the absence or presence of the sun in shifting the limits of the Trades, drawing them after him, as it were.

The presence of the sun in either hemisphere obstructs considerably the regularity and strength of the Trade-winds in that hemisphere, and _vice versa_.
The great difficulty experienced in making the outward-bound voyage commences after the ship has been deserted by the north-east Trade, for she has then to fight her way to the southward across the region of Calms and Variables.

But as these Variables blow generally from the southward and westward, from a cause afterwards to be explained, it is obvious enough why this part of the homeward voyage is always more easily made than the outward passage.