5*0 INDEX* 
Martlet. See Houfe-martin. 
Majkelyne , the Rev. Mr. his introduction to agronomical 
obfervations made at Pekin, p. 31. His reduction of 
M. de Luc’s rule for meafuring heights by the baro- 
meter to the Engiifh meafure of length, p. 158. His 
Obfervations of eclipfes of Jupiter’s firft fatellite, at 
Greenwich, p. 184. 
Matlock waters, their petrifying quality, p. 124. Thefe 
waters form a very fingular flratum, ibid. Not ap- 
propriated to the purpofes of bathing or drinking, 
•within the memory of fome perfons now alive, ibid. 
Mofs petrified by them exhibits beautifully-varied ap- 
pearances, p. 125. Ufed in building, ibid. The 
fource from whence their impregnation is derived pro- 
bably in fome degree exhaufted, p. 127. 
Matter , eleclric, not the fame as the matter of light, 
p. 419. 
Mephitic air , the medium by which the martial earths, &c. 
are kept diffolved in Pouhon water, p. 362. A mi- 
neral elaftic fpirit of a faline nature, p. 363. Saline 
concretes formed with this fpirit, how decompounded, 
-p. 365 — 368. In what mephitic air differs from all 
acid fpirits, p. 369. Its ufe in many difeafes, p. 370. 
Meridians , the true difference of, how belt deduced from 
the eclipfes of Jupiter’s fatellites, p. 188. 
Midwifery, .practitioners in, fhould pay particular atten- 
tion to the frequent deviations of nature, from her 
ordinary courfe, in the ftrudture of the parts of 
generation, p. 480. 
Monogram , a remarkable one on the reverfe of an ancient 
Roman coin, p, 318. Monograms ufed by the Etruf- 
cans, p. 324. And by feveral nations of the Eaft, 
P- 3 2 5 * 
Monton , a view of the births and deaths there during the 
laft ten years, p. 65. 
Moon, revolves at a diftance where the re fi fiance of the 
earth’s atmofphere is reduced almofl to its minimum, 
P- 2 7 4 * 
Mortality , 
