Professor Pictet read a paper on these glacieres before the Societe Helvetique des Sciences Naturelles at Berne, in 1822, which is to be found in the Bibl. Universelle de Geneve. M. Pictet left Geneva in the middle of July to visit the caves, but found himself so much knocked up by the first day’s work, that he sent on his grandson to the Glaciere of the Brezon, and gave up the attempt himself. The young man found it to be of small dimensions, 30 feet by 25, with a height of 10 or 12 feet. The ice on the floor was believed by the guide to be formed in summer only, and was placed too irregularly to admit of measurement. Calcareous blocks almost choked the entrance, and an orifice in the shape of a funnel admitted the snow freely from above, and was partly filled with snow in July. Cold currents of air proceeded from the rocks in the neighbourhood of the glaciere, giving in one instance a temperature of 38 deg..75, the temperature in the shade being 51 deg.. Within the cave, the temperature was 41 deg..
M. Morin visited this glaciere in August 1828. He describes it as a sheltered hole, in which the snow collects and is preserved.
M. Thury examined it in August 1859, and gives the same account. He, too, found the current of air which the younger Pictet discovered, but in the cave itself the air was perfectly still.