"The peaked top of this mountain is a mere heap of loose stones of all sizes. Whether the rock has been shattered in this manner by frost, by volcanic fire, or by lightning, I cannot tell; but I should think, from its appearance, by all three. Many of the stones are vitrified, and many are porous, like pumice-stones, although not so light.
"20th. I again went up Mount Skyring, taking a theodolite with me; and as the day was perfectly clear, and free from clouds, every point of land was visible, which can at any time be seen from that summit. Mount Sarmiento appeared in all its grandeur, towering above the other mountains to at least twice their height, and entirely covered with snow. Having set the theodolite to a painted post, fixed on shore near the Beagle (five miles distant), from which I had previously obtained the exact astronomical bearing of the spot on which the theodolite was placed; I obtained a most satisfactory round of angles, including most of the remarkable peaks, islands, and capes, within a range of forty miles from the mountain. The day was so fine, that it was not cold on the height, nor was there any wind to disturb the adjustment of the instrument.
"This business being completed, I returned on board with Mr. Wilson, who, during the time I was on the height, made some very good sketches. Even at this early period his drawings were becoming a valuable addition to the gleanings of our cruise, and their number increased fast; for he took much pains with them, and produced not only good drawings, but most accurate delineations of the coast.
"21st. Fine weather for this climate. Mr. Murray returned in the whale-boat, having had a successful trip.
"By shooting and fishing we obtained frequent change of
diet, for we shot much wild fowl (geese, shags, and ducks), and caught fish in the kelp, which were excellent eating. All that could be procured was regularly and equally distributed to the different messes in turn, and an account kept in a 'game book.' (Appendix.)
"22d. Mr. Stokes went to examine Fury Harbour, and returned late at night. In consequence of his account of the remains of the Saxe Cobourg sealing schooner, lost in that harbour, I sent a boat with the carpenter to collect from it some wood and bolts which might be useful to our ship, and remained at anchor for a day longer than I had intended.
"This day all hands were put upon two-thirds' allowance, but as it was a measure which affected the crew much and myself not at all, I was reluctant to give the necessary order, without first proposing the measure openly, and giving the following reasons:—
"Having succeeded beyond expectation in the examination of the coast thus far, and hoping to be able to continue the survey in the same manner, while our provisions lasted, I thought it better to shorten the allowance while all hands were well and hearty, and could obtain supplies of fish and wild fowl, rather than at a later period, when we might be otherwise situated. An extent of coast lay before us, and the parts particularly pointed out by Captain King, were yet unexamined.
"24th. A tolerably fine day; I tried all the compasses on shore, in three different places, placing them in a line to a distant mark; because in taking bearings, for the variation of the compass, during previous days, I had found very wide differences between the results of the same, as well as different compasses; and they were also very sluggish; the light cards being more so than the heavy ones. I found it impossible to reconcile their results by change of place or position, therefore it is probable that all the rock affected the needle; and I suspect that not only this island and the one on which Mount Skyring is situated, but most of the islands near are magnetic: particularly a cluster lying about a mile to seaward of the Magill Islands, on which, I believe, Lieutenant Skyring, or some of his party, took bearings. A boat was sent to