[ 6 27 ] 
Mufcular fibres of animals contain fixed and phlogifiicated airs, the inflammable principle 
in the fiate of heavy and light inflammable airs, and a fubflance which, by means of 
heat or putrefaction, is capable of being converted into animal hepatic air, p. 422. 
Mythology, revolution of the heavenly bodies applied by the Hindoos to, p, 560. 
N. 
Nardus Indica , or Spikenard, called by the Hindoos Terankus , that is, Fever-reflrainer, 
p. 286. A powerful medicine in all kinds of fevers, ib. Suppofed to be the Nardus 
Indica of the ancients, p. 287. The of Galen, p. 289. Called Nardus 
Gangnes by Diofcorides and Galen, p. 290. Exported from India to Persia and Arabia, 
ib. Ufed in long protra&ed fevers, p, 292. 
Nardus Italica . See Lavender . 
Negroes, indigo unhealthy to, p. 358. 
Nickel, a mixture of vitriolic and nitrous acids in a concentrated ftate a£ls upon, and 
principally calcines, p.373. 
Nitrous acid. See Acids . 
Norwood, its latit ude, longitude, & c. p. 232. 
Notre Dame Church at Calais, its latitude, longitude, Sec . p. 232. Refradion on the 
diftance between Dover Caltle and Notre Dame Church, p. 241. 
O. 
Obfervations on the fugar-ants, p. 346. See Ants. 
Oil. An oily matter produced by the union between fixed air, volatile alkali, and ani- 
mal hepatic air, p. 416. A fubflance, having the appearance of oil, formed by the 
combination of fulphureous hepatic air with fixed air and volatile' alkali, p. 417. 
Oil of vitriol and nitre, on the mixture of, p. 360. This mixture capable of diflblving 
filver eafily and copioufiy, but neither affects copper, iron, lead, reguiua of cobalt, 
gold, nor platina, p. 362. 
Operation , Trigonometrical, account of one, whereby the difiance between the meridians 
of the Royal Obfervatories of Greenwich and Paris has been determined, p. m. Re- 
ceived its commencement in the meafurement of a bafe on Hounflow Heath, ib. An in- 
firument, ufeful in the trigonometrical operation, made by Mr. Ranvfden, placed near 
Hampton Poor-houfe, on the fpot where the meafurement of the bafe had been completed 
about thirty-five months before, p. 112. Thecoafi triangles executed, p. 113. The 
operation continued through the firfl ten flations of the feries of triangles from Hampton 
Poor-houfe to one at v/rotham Hill inclulively, ib. The inflrument, with the various 
parts of the apparatus, removed to Dover, ib. White lights, fitted for long diftances, 
and reverberatory lamps provided for obfervation, ib. A very accurate plan of that 
part of Romney Marfti where the bafe of verification was to be meafured, made by 
Lieut. Fiddes, p. 1 14, The box containing the axis level blown down and broken, 
p. 116. The account of the trigonometrical operation divided into fedtions, p. 119. 
4 M 2 Sedtion 
