INDEX. 29 



Papavsr foniuferum [white poppy] . See Opium. 



Pcirrguay, account oi the fkeleton of a huge noii-defcr!pt quadruped dlfco- 

 vered there. Vol IV. p. 259. 



Panitiix of Venus, observations on it, Vol. I. p. 63, 102, 116, appsniitx 57. 



of the fun, important to be known, Vol I. p. 42 — how to de'er- 



mine it, ib. — further oblervations on die, 65, 73, 75, 77, 102, 103, 

 10^, appendix ■^^ 12, 54, 67 — explained, lOj^how to afcertain it with 

 the greatell poffible precifion, (ippnJix 40. 



and planets explained, Vol. I. p. 103. 



Purif, births and deaths there compared. Vol. III. p. 56. 



Par'ifian hvpothefis of the eccentricity of tlie earth's orb from the fun, and 

 diftancc, Vol. I. p. 103. 



Parfinpi, how to prefervc them for any length of time. Vol. II. p. 199. 



Partridge, with two hearts. Vol. II. p. 330. 



Pajf;ige of hci rings. Vol II p. 236. 



PdHetfon (Rob.) his method of finding the true meridian hne, and variation 

 ot the compafs, \'ol. II. p. 251 — his explanation of a fingular pheno- 

 menon. Vol III. p. 13 — on a new notation of mufic, 139 — his im- 

 provement on lightning rods, 321 \_gahied the Mjgeltaiiic priz,'~\ — his 

 eafy and accurate method of adjufting the glalFes of Hadley's quadrant, 

 on land, for the back-obfervaticn, Vol. IV. p. 154. 



Peacock-fiotuer defcribed. Vol. III. p. 229. 



P^a ('c-owiOTon <ror«^ excellent improver of foils, Vol. III. p. 227. 



Peap fecured againft infers, Vol. I. p. 222 — the time for fowing them and 

 preventing the worm, 243. 



Peale (C. IV.) his merit in ellablifliing a Mufeum, Vol. IV. p. 365. 



Pearfon (Javies) his account of the external contafl of Venus with the fun, 

 Vol. I. p. 50. 



Pelin, in what fimilar to Philadelphia, Vol. I. pref. p. iv. 



Penn (Tho.) fends a telefcope and micrometer to die Amer. Philof. Society's 

 committee for obferving the tranfit of Venus, Vol. I. p. 10. 



Penr.fyl-vnnia legillature alTilt the fociety's committee. Vol. I p. 10. 



, propofals for improving its inland navigation. Vol. I. p. 293 



— caufe and encreafe of bilious and intermitting fevers there, with hints 

 for preventing them, Vol. II. p. 206, 290 — its population in 1683, 

 Vol. III. p. 35 — and climate, 51 — its extent from ealt to weft. Vol. 

 IV. p. 35 — how bounded on the north, ib. p. 39 — mifcellaneous ob- 

 feivations on its weftern parts, 224 — cryftallized bal'altes found in, 445- 



Pendulum, an improved one invented and defcribed by Mr. Rittenhoufe, 

 Vol. IV. p. 27 — wooden pendulums imperfedl, ib. p. 29. curious expe- 

 riments on the fubjeft, ib. p. 30, 31. 



Perkins (Dr. 'John) his conjeiftures concerning wind and water-fpouts, tor- 

 nadoes and hurricanes, Vol. II. p. 335. 



Perftmott trees, profitable — their wood hard and charged with falts, Vol. 1, 

 p. 233 — yield a valuable gum, 234. 



■ fru't, memoir on the diftillation of. Vol. I. p. 231 — produces a 



fine fpirit, ib pref. p. viii. — preparation of it for the ftill, 232 — an ex- 

 cellent beer made from it, 234. 



4 D a Pelrifuaicns 



