in the saddle again, and we commenced to traverse a dreary plain of
yellowish white pumice-stone, interspersed with huge blocks of
obsidian, thrown from the mouth of the volcano. At first the monotony
of the scene was relieved by large bushes of yellow broom in full
flower, and still larger bushes of the beautiful _Retama blanca_,
quite covered with lovely white bloom, scenting the air with its
delicious fragrance, and resembling huge tufts of feathers, eight or
nine feet high. As we proceeded, however, we left all traces of
vegetation behind us. It was like the Great Sahara. On every side a
vast expanse of yellow pumice-stone sand spread around us, an
occasional block of rock sticking up here and there, and looking as if
it had indeed been fused in a mighty furnace. By half-past ten we had
reached the 'Estancia de los Ingleses,' 9,639 feet above the level of
the sea, where the baggage and some of the horses had to be left
behind, the saddles being transferred to mules for the very steep
climb before us. After a drink of water all round, we started again,
and commenced the ascent of the almost perpendicular stream of lava
and stone, which forms the only practicable route to the top. Our poor
beasts were only able to go a few paces at a time without stopping to
regain their breath. The loose ashes and lava fortunately gave them a
good foothold, or it would have been quite impossible for them to get
along at all. One was only encouraged to proceed by the sight of one's
friends above, looking like flies clinging to the face of a wall. The
road, if such it can be called, ran in zigzags, each of which was
about the length of two horses, so that we were in turns one above
another. There were a few slips and slides and tumbles, but no
important casualties; and in about an hour and a half we had reached
the 'Alta Vista,' a tiny plateau, where the horses were to be left.

The expedition so far had been such a fatiguing one, and the heat was