This passage will of course be attempted only in the Summer months: for admitting a ship to have gained so much to the westward, as to enable her to clear the west coast of New Holland, and to stretch to the northward, until she falls into the south-east trade wind, she will carry this trade in the Summer time probably quite home to the Cape; but in the Winter, north-west winds prevail in the neighbourhood of that coast, which would exceedingly retard her arrival there.
The passage southward by Cape Horn, I have sailed, and as a proof of the prevalence of westerly winds in those high latitudes, I made my voyage to the Cape of Good Hope, in ninety-one days, from Port Jackson, although I was so unlucky as to be detained beating off Cape Horn for seventeen days, with a north-east wind; which I believe is not very common there. This is rather a long voyage to be performed in that time, and yet I think it will be done twice in three times in less, although a distance of about 3300 leagues.
The northern passage, which can only be attempted during the Winter season, in the southern hemisphere, on account of the periodical trade winds in the Indian seas, and undertaken in such time as to ensure their reaching Batavia, before the setting in of the westerly winds there, which is generally in the middle or end of October. The dangers, currents, calms, and other delays to which we are liable in these little known seas, and of which we had much experience in the Waaksamheid transport, is the subject of the preceding narrative, which was written particularly for the information of your lordships, and principally with a view of showing the very great uncertainty of an expeditious voyage to Europe by that passage. I sailed from Port Jackson in March, and I can take upon me, without, I hope, being supposed to have presumed too much on my own judgment and experience to assert, that a ship leaving that port in the end of September, or beginning of October, taking her route by Cape Horn, would have reached England as soon as I have. The time I stopped at such places as I was obliged to touch at, will appear in the narrative.