Hist. de l'Acad., an 1712, p. 20.

[178]

C'est à dire—M. Billerez explains—à 10 degrés au-dessous du très-grand froid. What the 60° may be worth, I cannot say.

[179]

Tournefort (Voyage du Levant, iii. 17) believed that the ammoniac salt, of which the earth was full in some districts near Erzeroum, had something to do with the persistence of snow on the ground there.

[180]

Hist, de l'Acad., an 1726, p. 16.

[181]

But see on this point the experience of M. Thury, in the Glacière of S. Georges (Appendix).

[182]