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This distension of the blood-vessels would necessarily produce an inconvenience and a difficulty in the muscular action." Respecting this ascent, Arago states that M. Gay-Lussac has reduced to their proper value the narratives of the physical pains which aeronauts say they suffer in lofty aerial ascents.
All that has been said on the necessity of a communication with the damp ground to establish a circuit, is founded on inaccurate observations. M. Gay-Lussac made the important observation that when an insulated person touches the torpedo with one finger, it is indispensible that the contact be direct.
The vapours have no smell, and seem to be pure water. A short time before the great eruption of Mount Vesuvius, in 1805, M. Gay-Lussac and myself had observed that water, under the form of vapour, in the interior of the crater, did not redden paper which had been dipped in syrup of violets.
This proposition was made at a favourable time, and was, so far, carried out in the best possible way. The aeronauts who were appointed to carry out the expedition were Biot and Gay-Lussac, the most enthusiastic aeronauts of the period. The following is their report: "We observed the animals we had with us at all the different heights, and they did not appear to suffer in any manner.
Two years afterwards, Brioschi, the Astronomer-Royal at Naples, endeavoured to ascend to a higher elevation than had been reached by Monsieur Gay-Lussac namely, 22,977 feet. He was accompanied by Signor Andreani, the first Italian aeronaut. The balloon burst when at a great height, but the remnants were sufficient to check the descent so much that both gentlemen escaped with their lives.
MM. Davy and Gay-Lussac have already made the ingenious remark, that two bodies highly inflammable, the metals of soda and potash, have probably an important part in the action of a volcano; now the potash necessary to the formation of alum is found not only in feldspar, mica, pumice-stone, and augite, but also in obsidian.
The early ascents of Montgolfier had for their aim the establishment of the fact that any body lighter than the volume of air which it displaces will rise in the atmosphere; those of Roziers were undertaken to prove that man can apply this principle for the purpose of making actual aerial voyages; those of Robertson, Gay-Lussac, &c., were undertaken for the purpose of ascertaining certain meteorological phenomena; those of Conte Coutelle applied aerostation to military uses.
Our pulses were very quick; that of M. Gay-Lussac, which is 62 in the minute on ordinary occasions, now gave 80; and mine, which is ordinarily 89, gave 111. This acceleration was felt by both of us in nearly the same proportion. Nevertheless, our respiration was in no way interfered with, we experienced no illness, and our situation seemed to us extremely agreeable."
We also see that it can be decanted like a gas, that it will divide itself between two tubes of different capacity in obedience to the law of Mariotte, and will condense in a refrigerated tube in accordance with the principle of Watt, while it even complies with the law of Gay-Lussac. The activity of the emanation vanishes quickly, and at the end of four days it has diminished by one-half.
Gay-Lussac the chemist, Laplace the astronomer, Larrey the surgeon, de Suze the advocate, are here, and with them are Talma, Bellini, Rubini; de Balzac, Beaumarchais, Beranger; Moliere and Lafontaine, and scores of other men whose names and whose worthy labors are as familiar in the remote by-places of civilization as are the historic deeds of the kings and princes that sleep in the marble vaults of St.
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