. The quarterly journal of science. f sulphate of ammonia. Round thewalls of the crater were several small apertures, like small pipes,about an inch in diameter, some of which were emitting steam, andothers sulphurous acid vapours, v/liich show that they riuist haveproceeded from different sources, althoiigh some of the holes wereonly a few inches apart. The heat of the steam was considerable,for when I placed a thermometer graduated to 133^ within theirinfluence, the bulb burst. The extreme dryness of the atmosphere and the radiation ofthe suns rays were distressing; the lips cracked; the nai
. The quarterly journal of science. f sulphate of ammonia. Round thewalls of the crater were several small apertures, like small pipes,about an inch in diameter, some of which were emitting steam, andothers sulphurous acid vapours, v/liich show that they riuist haveproceeded from different sources, althoiigh some of the holes wereonly a few inches apart. The heat of the steam was considerable,for when I placed a thermometer graduated to 133^ within theirinfluence, the bulb burst. The extreme dryness of the atmosphere and the radiation ofthe suns rays were distressing; the lips cracked; the nails becamebrittle; the mahogany box, containing a Daniells hygrometer,became ungiued, and the case of a small pocket-sextant split evaporation of the wet-bulb thermometer was so rapid that itwas necessary to watch it closely, otherwise the muslin would bedry before the observation could be made. The basaltic lava and the trachytes of the Peak Avere magneticand had polarity, but I had no means of measuring it. l! uli-ce UJ. 1866.] Teneriffe. 21 The following were the observations made on the wall surround-ing the crater, and a few feet below the highest point:— Noou . ShelteredThermometer. 54=-25 Black BulbThermometer. 200= Dew-point ofDepression. 62^ Boiling-pointof Water. 191=-125 Barometer. 19=-093 Although the atmosphere ajDpeared perfectly clear, yet when Ilooked across the suns rays from the shade of a rock, there was anevident dust-haze, probably brought over by the wind from theneighbouring desert of Africa. The view from the top was most magnificent, the masses ofcumuh, which had been resting at an elevation of 5,000 feet abovethe level of the sea, had entirely disappeared; with the exceptionof the islands of Forteventura and Lanzarote, the whole of theCanarian archipelago seemed to be close under my feet, the moun-tains of Grand Canary appeared as if on the island below, Palma46 miles distant, and (xomera with Hierro were quite distinct. I think it must be
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectscience, bookyear1864
