INDEX. 



ilrat.i found in a chalk pit in the Ifle of 

 Wight, 183 — Additional obfervations, 

 242 



Fly-wheel, enquiries refpeiling Mr. 

 Woolf 's fubftitute for, 67, 133 ~ 



Fourcroy, n8 



Fruits, the engrafted varieties not perma- 

 nent, 227— Procefs for raifing and en- 

 creafmg new varieties, 228 — Fafts re- 

 fpeding their permanence, 230 



Fulminating muriate of filver, prepara- 

 tion of, 285 



* ' — — powder, dangerous, 77 



Furnace, defcription of a new wind, 119 



G. 



Galvanic pile, fecondary, 289 — With Ice, 

 303— With air interpofed infteadof wet 

 bodies, 305— Its adlion on cloth difks, 

 320 



Galv^nifm, laws of its aftioninthe com- 

 buftion of metals, 207 — Propofed ap-.-, 

 paratus for encreafing its power, 269— 

 Abftraft of Mr. Ritter's memoir on, 

 a88— Its aftion on cloth difks converts 

 them into foap of wool, 320 



Gafcs, on the expanfion of, by heat, 5 



'■ ' mixed, fcheme for Showing their dif- 

 tribution in the atmofphere, 17 



Gaflendi, 199 



Glafs-tubes, on the efflorefcence and de- 

 compofition of, 306 



Gmelin, 278 



Gough, Mr. on the art of writing In the 

 dark, 53 



Gravity, fpecific, of compounds, inftances 

 of anomalies in, 100 



Gridiron pendulum rods of lead and iron, 

 300 



Gum Arabic, propofed fubftitute for, 30 



" Kuteera, defcription and properties 

 of, 301 



Gun, to throw double-headed fhot, en- 

 quiries refpefting, 146 



Cuyton, 63 



H. 



Hail, figns of, 154 



Haflenfratz's firft memoir on coloured iha* 

 dows, 23 



Hatchalt, C. Efq. 91, 1 59 



Hawkins's, Mr. J. J. account of the in- 

 vention of a compound barrel and winch, 

 and its application on a large fcale, 267 



Heavenly bodies, general obfervations on> 

 210 



Heckewelder, Mr. 274 



Helcanthus annus, its cultivation recom- 

 mended, 128 



Herfchell, Dr. 202 — On the relative po- 

 rtions of double ftars, a 10, 252 



Heme's, Mr. obfervations on the ftruc- 

 tuve of the tongue, 47 



Hornblower, Mr. account of his machine 

 for fweeping chimnies, 246 



Howard, Edward, Efq. 159 



Huddart, Jofeph, Efq. defcription and ufc 

 of his ftation pointer, i 



Hunter, Mr. W. 51 



Haygins, 143 



Hyacinthus non fcriptus, preparation of, 

 as a fubftitute for gum Arabic, 30 



Hydraulic apparatus, eafy method of mak- 

 ing the joints, air » tight, 191 



Hygrometer, De Sauflure's, not to be de- 

 pended on in fome cafes, 16 



I. 



Ice, experiments on the evaporation of, 

 15 — Conjedlures refpeding its forma- 

 tion in the caverns of Grace-Dieu, 44 

 —Galvanic experiments with, 303 

 Jewelled holes not beneficial to time-keep- 

 ers, 205 

 Image in a concave fpeculum, and in % 

 concavo-convex mirror, enquiries re- 

 lative to the place of, 71, 236 

 Ink, utility of keeping cotton in it, 240 

 Infefts, figns of the weather from, 150 

 Inftrument for giving the fun's place by 

 two horizontal angles, i 



Johnfofij 



