[ 32 ? /] 
Mercury , experiments on the congelation of, p. 199. Vide Experiments. Quid fiher. 
Meteorological journal for the year 1788, kept at the apartments of the Royal Society, 
p. 1 1 4— 137. See Tables* 
Milner , Rev. Ifaac, on the production of nitrous acid and nitrous air, p. 300. 
Monjler of the human fpecies, account of, p. 157. See Gen tot) Boy. 
Morgan , William, on the method of determining, from the real probabilities of life, 
the value of a contingent reveriion in which three lives are involved in the fumvor- 
fhip, p. 40. 
Murijbong , 2 pleafant and healthy lituation, p. 82. The foil, rich and fertile, produces 
good crops, ibid. 
Mufcovy talc, a very perfect non-conduflor ; capable of being divided into plates of lefs 
thicknefs than a two-hundredth part of an inch ; in confequence of its great capacity 
gives very flrong'eleftric Blocks ; and its laminae, contrary to the afiertion of Bec- 
caria, are naturally in ftrong oppolite Hates of ele&ricity, and flafh to each other 
when torn afunder in the dark, p. 283. One folid inch of Mufcovy talc contains 
electricity enough to charge a eondu&or of 7 inches diameter, and 135 feet long, fo 
high as to give a nine-inch (park at lead, p. 286. 
N. 
Naja , a fpecies of ferpent, very venomous, p. 25. 
Natron , phofphorated, produces more cold by folution in the diluted nitrous acid, than, 
the vitriolic natron, p. 208. Vitriolated natron, added to marine acid, undiluted, 
produces very nearly as great a degree of cold as when mixed with the diluted nitrous 
acid, p, 2io. 
Nebula and clukers of ftars, catalogue of a thoufand, p. 236 — 254. See Tables . 
Nicholfon , Mr. William, on electricity, p. 263. 
Nitre , fpirit of, experiments on the phlogiflication of, p. 139. Light only capable of 
giving colour to fpirit. of nitre, contained in phials with ground Hoppers, p* 140. 
Experiment proving that heat and not light gives colour to fpirit of nitre, ibid. Spirit 
of nitre, in its moft dephlogifticared Hate, confifls of a proper faturation of the acids 
with phlogifton, p. 289. Experiment 011 fpirit of nitre, p. 2 91. 
Nitrous air* See Air • 
O . 
Obje-Elions to the experiments and obfervations relating to the principle of acidity, the 
compolition of water, and phlogifton, confidered; with further experiments and 
obfervations on the fame fubjeft, p. 7. 
Obfervations and experiments on the principle of acidity, the compolition of water, and 
phlogiflon, p. 7. Obfervations on the c*afs of animals called, by Linnaeus, Am- 
A a a 2 phibia 5 • 
