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As the temperature of the atmosphere, observed at the port of Orotava by M. Savagi, was 22.8 degrees, the decrement of caloric was one degree every 94 toises. This result perfectly corresponds with those obtained by Lamanon and Saussure on the summits of the Peak and Etna, though in very different seasons.

Lamanon and Monges made their experiments on the temperature of boiling water. These naturalists found it 88.7 degrees, the barometer at nineteen inches one line.

The soldiers, still restrained by Marius, waited till all had passed, and then the general struck his camp, and crossing the dip at Lamanon, where the overspill of the Durance had once carried its rolled stones into the Crau, he regained the heights on the farther side of the Touloubre, at Pelissanne, the ancient Pisavis.

For the more effectual prosecution of the design, several gentlemen were appointed to go out upon the voyage, who were known to excel in different departments of science and literature. Mr. Dagelet went as astronomer; M. de la Martiniere, P. Recevour, and M. de la Fresne, as naturalists; and the Chevalier de Lamanon and M. Monges, junior, as natural philosophers.

These results might lead us to suspect, that, in the experiment of M. Lamanon, the water had not reached the maximum of its temperature. Day was beginning to dawn when we left the ice-cavern. We observed, during the twilight, a phenomenon which is not unusual on high mountains, but which the position of the volcano we were scaling rendered very striking.