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tr ary to Mr. Sheele*s affertion, p. 331. The light fenfation on breathing inflammable 
air owing to its fpecific levity, p.352. Air lightened by fire breathed more eafily than 
more condenfed air, p.353. Why inflammable air can be breathed when mixed 
with common air, p. 355. Inflammable lighter than common air, and does not mix 
with it, p. 357. Account of the fparks which dart from the inflammable air of 
metals applied to a candle, p. 359. And which are the diftinCtive quality of inflam- 
mable air extra&ed from metals, ibid. Phlogiftic principle more combined with this 
air than with the others, p. 360. Analyfis of the decompofltion of the inflammable 
air of metals, p. 361. Great expectations from the ufe of the dephlogifticated air as 
a remedy, p. 377. Large quantities of it extracted from water which has flood fome 
time expofed to the fun, ibid. Reafon why gunpowder does not want a free 
accefs of common air to be confumed by fire, p. 404. Ufes which may be derived from 
the ability to produce any quantity of dephlogifticated at pleafure, p.416. The 
ufual flate of it in the Hartz mines a mean among the different ftates of the exterior 
air as found by Mr. de Luc’s obfervations, p. 495. Many modifications of it befides 
its weight and beat to be confidered, p. 496. Difference of the effeCls of heat on 
it one great caufe of the diverfity of refults in experiments, p. 498. Neceflity of 
multiplying meteorological infiruments to determine its influences, p.501. Expe- 
riments on air extracted from the water of a well, p. 432. That extracted 
from the water of the river Seine, fhevvn to be better than atmofpheric air, 
p. 434. Extracted from the water d’Arqueil, ‘ experiments on it, p. 436. Is 
Ihewn to be better than the air extracted from Seine water, p. 436, 437. That of 
diftilled water extracted, and fhewn to be better than that of the water d’Arqueil, 
P* 4 37. New characterise by which dephlogifticated air may be diftinguifhed from 
common, p. 439. A greater quantity of thofe airs which contain the leaf! phlogifton 
abforbed by water, ibid. Impoffible to determine the quality of it when extracted from 
veflels filled with water by means of fire, ibid. Refuh of experiments on water de- 
prived of air, p. 440. Water diminifhes the noxious part of tainted, and de- 
phlogifticates common, ibid. How to prevent it being altered by the vapour of 
the water, in the above experiments, p. 442. Common air fhaken in water is 
increafed in bulk, ibid. Dephlogifticated is decreased, p. 444. Which fhews 
that this laft differs eflentially from common air, ibid. Great nicety required 
in thefe experiments, p. 443. Experiments made to afeertain the falubrity of 
the atmofpherical in various places, countries, and fltuations, not to be depended 
upon, p. 446. Difference of the air between one country, or any particular 
fituation, and another, not fo great as is commonly imagined, p. 447. Air 
taken from different parts of Paris and London examined, and found not to 
differ materially, p. 447, 448. Differences between the changes of air at the 
fame place at different times, much greater than the difference of air of different 
2 places 
