INDEX. 



A. 



AcCUM, Mr. 58 



Acid, Gallic, new method of preparing it 



pure, 74 

 Moroxylic, chemical examination 



of, 129 



■ Sulphuric, is cvaporable, 15 

 Affinity between metals, experiments to 



prove, 176 — General conclufions, 180 

 Auguftite is not a fimple earth, but phof« 



phate of lime, 118 

 Air fiibftituted for wet cloths between the 



difks of a galvanic pile, 305 

 Air-pump, mercurial, of unlimited ex- 



haufting power, 188 

 Alcohol, its ufe in purifying rancid efTen- 



tial oils, 68— -Its adlion on prufliate of 



potafli, 285 

 Alphabet for writing in the dark, 57 

 Alum, new procefs for fabricating it ar- 

 tificially, 63 — The mother waters ufe- 



ful in making Pruffian blue, 64 — Profit 



from the procefs, 65 

 Amon ton's rotatory engine, 313 

 Apparatus, galvanic, of great power in 



the combuftion of metals, 269 



■ ■ — Hydraulic, method of making 



the joints air-tight, 191 

 — ■'■■ — for raifing water by the fall of 



wafte water, 298 

 -— — — for fweeping chimnies by a 



blafl of air, 246 

 ■•i^ — — for fupplying worm-tubs with 



water, 8i 

 Atmofphere, diftribution of the different 



gafes in the, \j 

 V©L.VII. 



Bancroft, Dr. 296 



Barometer, figns of the weather from, 

 156 



Barraud, Mr. on the Improvement of 

 time-pieces, 203— Rejefts jewelling, 

 204 



Barrel and winch, defcription of a com- 

 pound, 50— Peculiarity and difadvan- 

 tages of, 51— Account of its invention 

 in America, 267 — Ufeful application on 

 a large fcale, 268 



Barton, Dr. on the fafcinating faculty of 

 the rattle-fnake and other ferpsnts, 270 



Bartram, Mr. 274 



Batfon, R. Efq. on the caufe and cure of 

 the dry-rot, 315 



Beafts, figns of the weather from, 150 



Becker, 33 



Beer, remedy againfl; the effefts of thun- 

 der on, 122 



Beet-fugar, manufafture of, 118 



Benzenberg, Mr. on gridiron pendulum 

 rods of lead and iron, 300 



Berard, Mr. 53 



Berthollet, 91, 117, on the fuppofei cryf- 

 tallization of lime, 319 



Beryl, Saxon, analyfis of, iiS- 



Betanwert, 162 



Birds, figns of the weather from, 149 



Blakey, Mr. enquiries refpe£ling him, 310 



Blind, a method of writing calculated for 

 their ufe, 53 



Blue equal to ultramarine, 76 



Blue-beii, preparatiori of, as a fubftitutc 

 for gum Arabic, 30 



b Bodi«f^ 



