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The first ascents for scientific purposes were made about the beginning of the present century. In 1803, Mr Robertson ascended from Saint Petersburg, for the purpose of making electrical, magnetical, and physiological experiments. Messieurs Gay-Lussac and Biot followed his example from Paris, in 1804. Gay-Lussac was an enthusiastic and celebrated aeronaut. He made several interesting ascents.
The youngest of our two visitors was an Aragonian, his family had made him a monk against his will. These details were mostly borrowed from the secrets of confession. M. Biot manifested sharply the displeasure which this conversation caused him; there were even in his language some words which led the monk to suppose that M. Biot took him for a kind of spy.
The society in question was numerically an inconsequential band, listing only a dozen members; but every name was a famous one: Arago, Berard, Berthollet, Biot, Chaptal, De Candolle, Dulong, Gay-Lussac, Humboldt, Laplace, Poisson, and Thenard rare spirits every one.
Yet, according to the calculations of Biot, the heliacal rising of Sothis at the solstice was noted as early as the year 3285 B.C., and it is certain that this star continued throughout subsequent centuries to keep this position of peculiar prestige.
His thirst for knowledge, and his desire of investigating causes and effects, were never satiated. Astronomy was with him a subject of early and intense interest. He studied the works of Schubert, Lalande, Biot, and Lacroix, and constantly observed the heavens, and noticed their phenomena, according to the calendar.
Tested by experiment, it was found competent to explain many facts, and with transcendent ingenuity its author sought to make it account for all. He so far succeeded, that men so celebrated as Laplace and Malus, who lived till 1812, and Biot and Brewster, who lived till our own time, were found among his disciples. The Undulatory Theory of Light.
Every sweep of the rubber not only abolishes the rings, but introduces complementary ones, the black cross being, for the moment, supplanted by a white one. This is a modification of a beautiful experiment which we owe to Biot. His apparatus, however, confined the observation of it to a single person at a time. Colours of Unannealed Glass.
I had scarcely entered the Observatory, when I became the fellow-labourer of Biot in researches on the refraction of gases, already commenced by Borda. While engaged in this work the celebrated academician and I often conversed on the interest there would be in resuming in Spain the measurement interrupted by the death of Méchain.
They had been told of my turn for science, and that I had read the works of La Place. Biot expressed his surprise at my youth. One summer Somerville proposed to make a tour in Switzerland, so we set off, and on arriving at Chantilly we were told that we might see the château upon giving our cards to the doorkeeper.
It is a most interesting piece of scientific history, which shows how the problem which Biot in 1821 pronounced insolvable was in the course of a few years practically solved, with a success equal to that which Dollond had long before obtained with the telescope.
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