116 Analysis, §-c. of Cordier’s Essay upon the 
“ The first set of experiments, were made at the coal mines 
of Carmeaux, September, 1825. The mine was 316 metres 
(1028 feet) deep, with one airshaft. There wasa gallery 62 
about f 
> at 
6’. A hole was bored in the coal, ina corner of the gallery, 65 
centimetres deep, and 4 in diameter, with an inclination of 15°. 
It took six minutes to make the hole. The thermometer was 
inserted, and the hole stopped with paper. After an hour, it in- 
dicate 19 5’. The temperature of a well, 11,5 metres (37 3-4 
T : 3 
was inserted, was 192 metres Sos feet) from the surface. Hence, 
192 metres jess 11,5 == 180 metres produced an accession of 
heat of 6° 35: about one degtae for mene metres in depth. In 
rays 
for by the experiments of M. de Saussure they take six months 
to become sensible at ten metres (thirty-two feet) deep. Voya- 
ges dans les Alps § 1423. Annales de Chim. et de Phys. tom. 30, 
396, by M. Arago. In ihe cave under the observatory at Pa- 
~ twenty- eight metres deep, (91,86 English feet,) the ther- 
meter never — during the whole year, more than one-= 
thirty-third of a deg 
“In three other midusliacasl made at the coal mine of Decise, 
one gave one degree of the Cent. thermometer for 15,16 me- 
tres; another one degree for 15,52 metres; and another one de- 
gree for 14,81 metres. At oes rts accession a ane t appeared 
to be one degree for 19,28 metres, 
At Carmeaux, Cordier made ten experiments; at Lit 
as many; and at Decise the same number. The average 
accession of heat, was one degree for thirty-six metres at 
armeaux : one degree for nineteen metres at Littry: one 
ogree fifteen metres at Decise. , va one degree for 
nty-thre .one-third metres dee aris observat 
one degree for twenty-eight metres, J ~ 
M. Cordier, after these details, proceeds to draw the gen- 
eral conclusions which he thinks. they suggest. But io this 
stage of our analysis of this ni paper, we think it 
: fi to make two or three bservations, including a notice 
the —— ces whic i in our opinion he has not —_ 
