“Its circumference, I think, must be at least half a mile; as it took us above half an hour to walk round it, including every allowance for the bad road, and stopping a little. At its highest part, which is the south end, comparing it with a known object, it seems to equal the dome of St. Paul’s church. It is one uninterrupted mass of stone, if we except some fissures, or rather impressions, not above three or four feet deep, and a vein which runs across near its north end. It is of that sort of stone called, by mineralogists, _Saxum conglutinatum_, and consists chiefly of pieces of coarse _quartz_ and _glimmer_, held together by a clayey cement. But the vein which crosses it, though of the same materials, is much compacter. This vein is not above a foot broad or thick; and its surface is cut into little squares or oblongs, disposed obliquely, which makes it look like the remains of some artificial work. But I could not observe whether it penetrated far into the large rock, or was only superficial. In descending, we found at its foot a very rich black mould; and on the sides of the hills, some trees of a considerable size, natives of the place, which are a species of _olea_.[102] “In the morning on the 20th, we set out from the _Pearl_; and going a different road from that by which we came, passed through a country, wholly uncultivated, till we got to the _Tyger_ hills, when some tolerable corn-fields appeared. At noon, we stopped in a hollow for refreshment; but, in walking about here, were plagued with a vast number of musquitoes or sand-flies, which were the first I saw in the country. In the afternoon we set out again, and in the evening arrived at the Cape Town, tired with the jolting waggon.” On the 23d, we got on board the observatory, clock, &c. By a mean of the several results of the equal altitudes of the sun, taken with the astronomical quadrant, the astronomical clock was found to lose on sidereal time, 1ʹ 8ʺ, 368 each day. The pendulum was kept at the same length as at Greenwich, where the daily loss of the clock on sidereal time, was 4ʺ. The watch, by the mean of the results of fifteen days’ observations, was found to be losing 2ʺ 261, on mean time, each day; which is 1ʺ 052 more than at Greenwich: and on the 21st, at noon, she was too slow for mean time by 1^h 20ʹ 57ʺ 66. From this, 6ʹ 48ʺ, 956, is to be subtracted, for what she was too slow on the 11th of June at Greenwich, and her daily rate since; and the remainder, viz. 1^h 14ʹ 08ʺ 704, or 18° 32ʹ 10ʺ, will be the longitude of the Cape Town by the watch. Its true longitude, as found by Messrs. Mason and Dixon, is 18° 23ʹ 15ʺ. As our observations were made about half a mile to the east of theirs, the error of the watch, in longitude, is no more than 8ʹ 25ʺ. Hence we have reason to conclude, that she had gone well all the way from England, and that the longitude, thus given, may be nearer the truth than any other.