[ 448 1 
L. 
Later from Dr. Withering to Jofeph Prieftley, L L D. relrting to the principle of aci- 
dity, the decompofition of water, and phlogifton, p. 319. Another from James Keir, 
Ei'q. to the fame, on the fame fubjeft, p. 3 23. A letter from Richard Walker, to 
Henry Cavendifh, Efq. on the production of artificial cold, p. 395. Extract from a 
fecond letter from Mr. Walker to Henry Cavendifh Efq. on the lame fubjedt, p. 402. 
Life, attraction of, p. 29. See Attraction of life. 
Lufus Natures, fingular, defcribed, p. 352. 
m. 
Mahometans, on the era of the, p. 414. The vulgar or practical reckoning of the Maho- 
metans, p. 418. The political or chronological mode of reckoning among them, ibid. 
Upon the political or chronological nmde of computation on which the Turkifh, 
Moorifn, and every lyftematic Mahometan calendar are founded, p. 419. 
Manganefc. See Experiments. 
Marfden , William, Efq. on the era of the Mahometans, called the hejera, p. 414. 
Medicagofalcata , obfervations on, p. 162. 
Medicine , in the hands of the Greek phyficians from the time of Hippocrates, or rather 
from thedeflruCtion of the Egyptian monarchy by Cambyfes, down to the time of the 
Crufades, p. 33. 
Meteorological Journal for the year 17 87 kept at the apartments of rhe Royal Sociery, p. 
191. See Tables. Explanation of the inftruments with which the meteorological pb- 
fervations were made, p. 217. 
Minwfa fenjitiva and pudiccs, irritable vegetables, p. i6t. 
Minium . See Experiments . 
Mixture , powerful frigorific, p. 395. Frigorific mixtures recommended, efpecially in 
hot climates, p. 398, 399. 
"Morgan , William. See Survivorjbips. 
Motions , all original, are by their nature perfectly unintelligible as to their caufe, p. 3^0 
Mountains, coldnefs of the fummits of, p. 47. 
Muriatic acid , its client on the freezing point of water, p. 307. 
Mufcular motion, Oroonlan leCture on, p. 23. 
Mufual Injlrumtnts, or the temperament of thofe in which the tones, keys, or frets, are 
fixed, as in the harplichord, organ, guittar, &c. n. 238, 
3 
Native 
