49© INDEX. 
Monro, Dr. Donald, his account of feveral mineral waters 
in Scotland, p. 15. 
N. 
Nairne , Mr. contriver of a new dipping-needle, p. 476. 
His experiments with it, p. 477. 
'Natural Hifiory , its progrefs during feveral centuries and 
among different people, p. 295. 
Newland, Capr. Charles, obfervations in a voyage to 
the Red Sea, p. 77, 78, &c. His method of di- 
fliiiing frefh from fea water, p. 90. His obfervation$ 
on the milky appearance of fome fpots of water, p. 
93 ? . . _ 
Niccmachus , Extracts from his arithmetic about Eratof- 
thenes’s fieve corrected and explained, p. 339. 
Nightingales , whether they can migrate at any diftance, 
p. 300. Not attended to at certain times, p, 32. 
Nitrous a;r , formed from a foliation of metals in fpirits 
of nitre or aqua regia, p. 210. Its redaction of 
common air, p.211. The beft teft of the fitnef? 
of air for refpiration, p.214. Its phenomena with 
different kinds of noxious air, p. 215, 216. Re- 
duced to one fourth by a fixture of iron filings and 
brimflone, p. 217. Noxious p plants and animals^ 
ibid. Readily abforbed and obflinately retained in war 
ter, p. 218, 219. A great preferver from putrefaction, 
p. 223. Proportion in which it may be got from fe- 
veral metals, p. 322. 
'umbers , See Vrime. 
Q. 
Oak , a new fpecies obferved and reared by Mr. Lucombe, 
128. Its fpeedy growth deferibed by Mr. HolwdJ, p. 
129, &c. 
pboles 5 Six in a dram, p. 470. 
6 
Oera ilhi 
