BerVm, duration of human life at, Vol. III. p. 59. 



Bldclle fOivtnj and others, their account of the tranfit of Venus in 1769, 



Vol. I. p. 89. 

 BUlings (Cact.) thermometrical journal of the temperature of the air and 



water at fea. Vol. III. p. 200. 

 Bi.'/ious and intermitting fevers of Pennfylvania, inquiry into the caufe of, with 



hints for preventing them, Vol. II. p. 2(i6. 

 Births and deatlis in certain places, proportion of, Vol. III. p. 30, 43, 54, 



56, 59 — proportion of, as to m.irriages, ib. 



in Trance and England compared, 35. 



Bifciiit, (fignifying twice baked) the original name for rufk, Vol. II. p. 



322- 



Black-leat!, a large bed of. Vol I. pre/, xii — the beft; point for metallic con- 

 dudtors, Vol. III. p 322. 



BM'^e-cape, W. Florida, latitude of. Vol. I. p. 253. 



Block, defcription of a newly-invented fpring-block, for aflTifting veffels in fail- 

 ing. Vol. III. p. 331. 



Blue hoy, fome obfervations on a, Vol IV. 138. 



Blue-ri ge in Vii-ginia, barometrical mcafurement of it, Vol. IV. p. 216— 

 formation of tlie country beyond, 246 — nitrous caverns there, ib. 



Boats, various modes of propelhng. Vol. il. p. 307. 



Chinefe, how rowed, ib. 



■ a new conftruftion propofed for, 309 — another defigned for American 



inland navigation. Vol. IV. p. 298, 301. 



Boiguira [^crotalus horridus] See Rattle ftiake 



Bones of a non-defcript great clawed animal difcovered in a nitrous cave in 

 Virginia, Vol. IV. p 246 — of another at La .• lata in Paragu.iy, p. 259 

 — others found in Virginia, 439 — ob'ervations on thofe of the Mam- 

 motli, 510 — See Mammoth bones — Anatomical deicription of, p. 526. 



— (Shark's) abundance of found ioffil in Virginia, Vol. IV. p 439. 



j8 Bootes and die pole ftar, right afcenfion and declination of, Vol. III. p. 

 116. 



J?»<a»!Va/ defcription of cryptogamic plants. Vol. III. p. 202. 



of the caflia chamscrilla. Vol. III. p. 228. 



of a poifonous plant, Vol. III. p. 234. 



of the podophyllum diphyllum of Linnsus, Vol. Ill, p, 



334- 



Boiham on the making of E. India fugar. Vol. III. p. "9. 



Bradley (John) his account of the tranfit of Venus and eclipfe of tlie fun, as 

 obferved in 1769 at Lizard point (G. B. ), Vol. I. p 114. 



Brajs and iron fooner tamifh and ruft in woody than cleared land, Vol. IV. 

 p. 226. 



Bi-eajl, fugar ufeful in diforders of the. Vol. III. p. 75. 



Biejlaiv, calculations of life there. Vol. Ill p. 57. 



Bryant (IViltiam) his account of an eleftrical eel, the torpedo of Surinam, 

 Vol. II. p. 166. 



Brt/lnl^ ( Pennf.J chalybeate waters of, Vol. I. p. 305 — difeafes cured or re- 

 lieved thereby, 310. 



Britain 



