C 491 3 
A N 
INDEX 
TO THE 
SEVENTY-FIFTH VOLUME 
OF THE 
PHILOSOPHICAL TRANSACTIONS. 
jiir, .experiments uu, uy Henry Cavendifh, Efq. p. 372, The diminution of the 
air by the eledtric fpark depends upon the converfion of phlogifticated air into nitrous 
acid, ibid. Defcription of the apparatus made ufe of (tab. XV.), ibid. Fig. 1, 2, 
and 3. explained, p. 373. Method of forcing the elediric fpark through the tube, 
p. 374. Experiments, when the eledlric fpark was palled through common air, 
included between lliort columns of a folution of litmus, ibid. When lime-water was 
ufed inftead of the folution of litmus, ibid. With impure dephlogi (Heated air, p. 
375. Obfervations on the refults of thofe experiments, ibid. When airwas confined 
by foap-lees, 375 — 377. Experiments to determine what degree of purity the air Ihould 
be of, in order to be diminifhed the molt readily, and to the greateft degree, p. 376. 
Precipitation of a folution of filver by phlogifticated nitre, p. 377. General reafoning 
upon all the expe iments, p. 378 — 380. Method of preparing the foap-lees, and 
dephlogifticated air s ufed in thefe experiments, p. 380. Quantities of each ufed therein, 
p, 381. Experiment to determine whether all the phlogifticated air of the atmofphere 
is of the fame nature, p. 381— *382, See Phlogifticated Air . Another caufe of the 
A. 
T t t 2 
dimi- 
