to gather sulphur on its edges, deposited there by the hot fumes. (Doubted as above. E.)
"Baron Von Humboldt was the first, who came as far as the mouth of the crater, but he did not descend into the latter; he contented himself with making some astronomical observations and like Baron Von Gros, who was there considerably later, afterwards published a geological analysis of the volcano.
"In the year 1856, a scientific expedition was undertaken, headed by the engineer Gen. Gaspar Sanchez Ochoa. Until then an exact description of the Popocatepetl had never been made and it was only through this expedition, that plans of the interior of the mountain were obtained, as well as a description of the horizontal projection of the crater, and the crater itself, its deposits of sulphur, etc., which were published soon afterwards, including a chemical, geological and botanical analysis.
"By the labors of this expedition it was ascertained, that the Popocatepetl rises to nineteen thousand four hundred and forty-three feet above the level of the sea, according to Gaylusac's barometer, which, in fact, differs but slightly from Von Humboldt's statement of nineteen thousand four hundred and forty feet above sea-level.
"The snow-fields of the volcano cover a surface of more than three thousand metres, stretching from its maimed summit away down to the sandy regions of its slopes, where may be seen and noticed the effects and devastations produced by its former fearful eruptions of lava and inflammable matter, as well as many rocks of black and gray basalt, all kinds of tezontles, valuable stones of various, colors, and red, yellow and black clay.
"The excavations, which, have been carried on in the slopes, where vegetation exists, have revealed many remnants of vegetable coal in an advanced state of petrification, which clearly testifies, that immense numbers of trees must have become carbonized by the hot lava, flowing at such a great distance.
"It would be very difficult, to designate with any exactness the time of the first outbreak of the Popocatepetl, but it may be as remote as four thousand years, judging from the result of
