[ 6l6 3 
and ariifts than vitriolic acid and nit: e, ib. Nitre, difiolved in oil of vitrio’, capable 
of diflblving filver, ib. A mixture of vitriolic and nitrous acids in a concentrated 
flare has a peculiar faculty of diffolving filver copioufly, p. 375. A mixture of 
vitriolic and nitrous acids in a concentrated irate afts upon, and principally calcines, 
tin, mercury, and nickel, ib. A mixture of vitriolic and nitrous acids in a concen- 
trated ftate, diluted with water, lefs capable of diflb'.ving fiver, but more capable 
of aftincr on other metals, ib. This mixture of highly concentrated vitiio ic and 
nitrous acids acquires a purple or violet colour when phlogillicated, either by addition 
of inflammable fubftances, or by its aftion on metals, or by very ftrong impregnation 
of oil of vitriol with nitrous gas, ib. On the precipitation of filver from nitrous 
acid by iron, p. 574. Iron precipitates copper from nitrous acid, p. 375. Copper 
will precipitate filver from nitrous acid, ib. On <.nc alterations whicn 1 on, or it» 
furface, undergoes by the adtion of a folution of filver in nitrous acid, or of a pure 
concentrated nitrous acid, p. 379. 
JEras of the Hindoos and Siamefe. See Hindoos . Siam . 
Air. Experiments on the analyfrs of heavy inflammable air, p. 51. Experiments to 
determine in what proportion the dephlogifticated air is fufticient to fatara e in- 
flammable air, and what quantity of fixed air they produce when inflamed, 
p. 58. Heavy inflammable air contains light inflammable air in great abuu- 
dance, p. 64. Fixed air not formed during the leparation of the light inflam- 
mable air from the heavy inflammable air, ib. The electrical fhock feparates a fub- 
ftance from the heavy inflammable air, which has fome leading charadters of an 
alkali, p. 63. Heavy inflammable air, through which the eledtrical lpark has been 
repeatedly pafled, when burnt with any proportion of dephlogilticated air, does not 
produce fo much fixed air as the fame quantity of inflammable air not eledtrified, ib. 
The refidues, after inflaming decompofed air, are generally greater than thofe from 
the air in its natural ftate, or than can be accounted for from the mixture of the 
heavy inflammable and dephlogifticated airs, ib. Charcoal, decompofed by heat 
only, produces phlogifticated and heavy inflammable airs, p. 68. Phlogillicated and 
heavy inflammable airs combined, conftitute charcoal, p. 69. Red precipitate, 
mixed with iron filings, yields very pure, fixed air, p. 71. Brals duft, mixed with 
led precipitate, yields fixed air, ib. Turbith mineral and iron filings afford much 
lefs fixed air than red precipitate and iron filings, ib. Dephlogifticated air, being 
applied to the outfide of a vein, changes the colour of the blood contained in it, p. 
107. The fameeffe&ed by the fimple difeharge of phlogifton from the blood, when 
it had an opportunity of uniting with the dephlogifticated air thus prefented to it, ib* 
Cancerous matter contains a principle which has many of the properties of hepatic 
a i r> p. 398. Of the air extricated from cancerous matter, and from animal fub- 
ftances, by diftillation, p. 399. Animal hepatic air, when abforbed by water, not 
capable of being again difengaged by a heat which raifes water to a boiling tempera- 
ture, p. 406. Fixed air produced by the combuftion of pure and inflammable airs, p* 
408* Equal parts of pure and animal airs being burned together, produce an increafe 
of 
