l6 INDEX. 



Greenrxiay (Dr.) his account of the beneficial efFe(5ls ofcaffia chamserifta on 

 worn-cut or poor lands, Vol. III. p. 226 — his communication on a 



fuppofed volcano in N. Carolina, 223 — his account of a poifonous 



plant in Virginia, 234. 

 Grift-mills, obfervations on, Vol. IV. p. 350. 

 Grauchain (DeJ on a folar and lunar eclipfe obferved in 1780, Vol. II. p. 



239- 



Gvoito at Swatara in Pennf. defcribed. Vol. II. p. 177. 



Groimi-rattk-fnake, fome account of the. Vol. IV. p. 367. 



Gruh-'W'jrm, how to prcferve the vine from it, Vol. I. p. 164. 



Gulf ftream, obfervations on it. Vol. II. p. 314 — its warmth, 325 — Doi^or 

 Franklin's obfervations on it confirmed. Vol. III. p. 83. Further re- 

 marks on that ftream, S6, 96, 194. 



Gum copal, fuppofed to exude from a fpecies of American fumach, Vol. I. 

 pref. ix. 



Gums (viz.) perfimon. Vol. I. p. 234. — maftick, 257 — ftorax, ib. — fcam- 

 mony, ib, — dragon, 259, 264 — copal, pief. ix, 262 — fenegal, 263 — 

 arable, ib. — labdanum, 264 — galbanum, ib. — oppoponax, ib. — myrrh, 

 265 — benjamin, ib. — ammoniacum, ib. — alTafuetida, 266. 



H 



Hadlefs quadrant, an eafy and accurate way to adjuft the glades of it, on 

 land, for the back obfervation, Vol. IV. p. 154. 



Halley (Dr.) errors in his tables. Vol. I. p. 102 — obferves a remarkable pe- 

 riod in the planet Mercury's motion, npperdix 53 — firft conceived the 

 method of alccrtaining the fun's parallax, 54. 



Hare and Siinner's natural hiftory of the filk-worm from the egg to the co- 

 coon ; with the mode of obtaining the filk, &c. Vol. II. p. 347. 



liarpfichords, an improved method of quilling. Vol. II. p. 185, 190. 



Heart (Jonathan) on American Indians and fome ancient works, Vol. III. 

 p. 214. 



Hearts, two found in a partridge. Vol. II. p. 330. 



Heat, concerning the origin of, Vol. I. appendix p. 32 — different modes of 

 exciting it, ib. — the effeft of vibratory motion, ib. — its proportion re- 

 gulated by the face of cottntry, p. 273 — the caufe of moft winds, ib 



whence heft reflefted, 275 — defcription of a new machine for prcferving 

 an equal degree of, 286 — ^its expanfton of wood, Vol. IV. p. 29 — 

 enlarges the capacity of eleftric air, Vol. II. p. 79 — the ftrongeft at- 

 traftion between it and water, 144 — deftroys magnetifm, 18c. 



and light, a curious theory of. Vol. IIJ. p. 5 — both deemed fubftances, 



Voh IV. p. :i. 



/^fi/rw language, obfervations on it. Vol. III. p. 264, 276. 



HecLiivelder (Rev. John) his account of the remarkable inftinft of a bird call- 

 ed the nine-killer (lanius exculilor) Vol. IV. p. 124 — his account of a 

 fuppofed animal called by the Indians the big-naked-bear, Vol. IV, p. 

 260. 



Hemp 



