31 ([Return])
There has been much speculation in regard to the origin of the saline properties of this water; but the Artesian borings going on while I was in Mexico, I think, sufficiently demonstrate that the earthy bottom of the valley, for hundreds of feet, contains an infusion of carbonate and muriate of soda.

32 ([Return])
The atmosphere of Mexico is so intensely dry, that the hygrometer of Deluc frequently descends to 15°.—Humboldt's Essai Politique, vol. ii. p. 110.

33 ([Return])
When the Artesian well, in process of construction near my residence, had reached a depth of seventy yards, the water that came up was slightly impregnated with this salt.

34 ([Return])
Comércio de Mexico, 1852.

35 ([Return])
Essai Politique, vol. ii. p. 61.