of the coast, along which I have sailed, either in this or my former
voyage. The latitudes have been determined by the sun's meridian
altitude, which we were so fortunate as to obtain every day, except the
one we sailed from Christmas Sound, which was of no consequence, as its
latitude was known before. The longitudes have been settled by lunar
observations, as is already mentioned. I have taken 67 deg. 46' for the
longitude of Cape Horn. From this meridian the longitudes of all the
other parts are deduced by the watch, by which the extent of the whole
mast be determined to a few miles; and whatever errors there may be in
longitude, must be general. But I think it highly probable that the
longitude is determined to within a quarter of a degree. Thus the extent
of Terra del Fuego from east to west, and consequently that of the
straits of Magalhaens, will be found less than most navigators have made
it.

In order to illustrate this and to shew the situations of the
neighbouring lands, and, by this means, make the chart of more general
use, I have extended it down to 47 deg. of latitude. But I am only
answerable for the accuracy of such parts as I have explored myself. In
laying down the rest I had recourse to the following authorities.

The longitude of Cape Virgin Mary, which is the most essential point, as
it determines the length of the straits of Magalhaens, is deduced from
Lord Anson, who made 2 deg. 30' difference of longitude between it and the
Strait Le Maire. Now as the latter lies in 65 deg. 22', Cape Virgin-Mary
must lie in: 67 deg. 52', which is the longitude I have assigned to it, and
which, I have reason to think, cannot be far from the truth.

The strait of Magalhaens, and the east coast of Patagonia, are laid down
from the observations made by the late English and French navigators.

The position of the west coast of America, from Cape Victory northward,
I have taken from the discoveries of _Sarmiento_, a Spanish navigator,
communicated to me by Mr Stuart, F.R.S.

William Babington Maxwell (18661938) was a British novelist. He was a son of novelist Mary Elizabeth Braddon. Though nearly 50 years old at the outbreak of the First World War, he was accepted as a lieutenant in the Royal Fusiliers and served in France until 1917.

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