204 Miscellanies. 



temperature in this bore was pretty regularly 2°.25 F. for every 100 

 feet. The deepest observation was at a point more than 200 feet be- 

 low the level of the sea ; for the place where the bore begins, lies 

 111 feet above the level of the Pegel near Magdeburgh, which itself 

 is about the same height at Berlin, whose elevation above the Baltic 

 has been lately determined to be 108°. 5 Rhenish feet. — (Poggen- 

 doriF's Annalen, vol. xl. p. 145.) — Edinburgh New Philosophical 

 Journal, July, 1838. 



33- Subterranean Temperatures. — M.Walferdin has communicated 

 a notice to the Academy of Sciences, on a pit sunk by M. Mulot at St. 

 Andre {department de I'Eure,) and on observations of temperature 

 made in that pit, at a depth of 830 English feet. The sinking has 

 been carried to a depth of 862 feet, without any spouting spring be- 

 ing met with. The following is the series of substances traversed, 

 together. with their thickness : 



Plastic clay. 

 White chalk, 

 Chalk marl, 

 Glauconite, 

 Green sand, 



M. Walferdin made an observation on the temperature at a depth of 

 830 feet in this pit on the 18ih of June last. Two of his thermome- 

 tres a deversement were set down, each enclosed in a glass tube, 

 sealed by the lamp at its two extremities; and after a period of ten 

 hours, the one was found to indicate 64*^.32 F., and the other 64°.27 

 F. The mean temperature of the plateau of St. Andre being un- 

 known, M. Walferdin has taken as his point of departure, the temper- 

 ature of the only pit existing in the commune, which he has found to 

 be 53°. 96 F. at a depth of 246 feet. By calculating, according to 

 these data, the increase of temperature with the depth, we find it to 

 be 1°.8 F. for every 101 feet 6.55 inches. M. Walferdin compares 

 this result with those obtained previously from observations made in 

 the pit sunk at Grenelle, and in that of the Military School, adopting 

 as a point of departure, the constant temperature (53°. 24) of the cel- 

 lars of the observatory, at a depth of 91 feet 10 inches. Two exper- 

 iments, made at different times in the pit of Grenelle, at a depth of 

 1312 feet 4.31 inches, give for 1°.8 F. 103 feet 3.17 inches, and 101 

 feet 3.39 inches. In the pit at the Military School, (also sunk in 

 chalk,) and distant about 1968 feet from the pit of Grenelle, at a depth 



