[ 8 9 o ] 
reeling its error, p. 801, 802. Dercription of an inftrument for this purpoie, p. 803 
— 80. Remarks concerning its ufe, 809 — 812. Dr. Malkelyne the firft inventor 
of it, p. 812 — 813. 
Mines. Barometrical obfervations on the depth of the mines in the Hartz, p. 401. See 
Barometrical okfervaticns. Concerning the air in mines, p.412—416. Method of 
working the lead-mines in the Ramellberg near Goflar; p. 417. The fubterraneous 
geometer’s method of finding the depths of thefc mines, p. 423, 424. 
Moijhtre or drynefs of the atmofphere, evaporation confidered as a tell of it, p. 244. 
See Evaporation . 
The Mole, one of the Alps, an account of it, p. 333 — 539. Barometrical obfervations 
to afcertain its height, p. 539 — 546. 549, 550. 
Molyneux , Mr. Remarks on the defeds in his method of pclifhing the fpeculum for 
jefleding telefcopes, p. 318 — 320. A more perfect method of polilhing and giving 
a corred parabolic figure to the metal at the fame time, p. 327 — 333. 
Mont Salens, one of the Alps, an account of it, p. 515, ». 527. Barometrical obferva- 
tions to afcertain its height, p. 515—332. 552 — 554. Concerning Mr. De Luc’s 
obfervations thereon, 715, 716. 729, &c. Rule deduced from thefe obfervations, 
p. 655, 656. Expanfion of quickfilver in the tubes of his barometers refulting from 
the obfervations, p. 656—658. 
Moon, its action upon the earth’s axis confidered, p. 267 — 288. 
Mortification, The treatment to Hop a mortification, p. 460 — 46 u 
Motion. A new theory of the rotatory motion of bodies affeded by forces dillurbirg fuck 
motion, p. 266 — 2 95.. 
Mountains , obfervations made in Savoy, in order to afcertain their heights by means of 
the barometer; being an examination of Mr. De Luc’s rules, delivered in his Re - 
eh er ekes furies Modifications de V Atmofphere, 513. Initruments ufed on this occafion, 
515. Firft feries of obfervations on Mont Saleve, ibid. Method of meafuring it, 
p. 516, 517. Determination of the bafe, p. 518. Determination of the angles by 
the equatorial, p. 519, 520. Determination of the vertical angles, p. 521, 522. 
Determination of the Tides, p. 523. Method of making the barometrical obferva- 
tions, p. 524— -528. Comparifon of the firft feries, p.52.9. Comparison of the 
fecond feries, p. 530. Comparifon of the third feries, p. 531. Barometrical rules a 
little defedive as to the true ratio between the gravities of air and quickfilver, 
p. 532. Inftruments ufed for making barometrical obfervations on the mole, p- 
53 h 534 ’ Meafurement of this mountain, p. 539, 540. Comparifon of the firft 
Series of observation, p. 541. Comparison of the fecond feries, p. 542. Compan- 
ion of the third feries, p. 543. Comparifon of the fourth feries, p. 544. Comparifon 
of the fifth feries, p. 545. Comparifon of the fixth feries, p.546. Barometrical 
fules defedive by thefe experiments, p. 547. Remark thereon, p.547, 548. Ob- 
fervations on the mole by M,.de Sauffure, making a defed of Mr. De Luc’s rules,. 
P- 5 + 9 » 
