INDEX. 491 



Oenanthe crocata, a poifonous plant, found to have great 

 virtues in the cure of fome cutaneous diforders, p. 470, 

 &c. 



P. 



Parallax of the Sun, deduced from the obfervations of 



the laft traniit of Venus, p. 6g, &c, 

 Paralletifm of the two furfaces of the index glafs in Had- 

 Jey's quadrant, necefifary for the exa&nefs of obferva- 

 tions, p. 115,116. How the errors arifing from the 

 want of it may be remedied, p. 116, 117. 

 PembertOn, Dr. Henry, his geometrical folutions of fome 



aftronomical problems, p. 434. 

 Perchal, Dr. Thomas, on the waters of Buxton and Mat- 

 Jock, p. 455. 

 Per/on killed by lightning, p. 135. 

 Phlogifton, an overload of it may infect air, p. 231. and 



is probaby abforbed by growing plants, p. 233. 

 Pitkeatly, near Perth, its purging water defcribed by Dr. 



Wood, p. 27. Anal y fed by Dr. Monro, p. 27, 28. 

 Plants, in a'ftate of vegetation, prevent the alteration which 

 flame produces in the air, p. 166. And reftore it 

 when vitiated, p. 163, 169. 

 Porcupine quills, dyed by the natives of Hudfon's Bay in 



red and yellow, p. 46. 

 Port/mouth, its latitude deduced from aftronomical ob- 

 fervations, p. 38. 

 Prtnefle the town of, worfhiped Fortune, p. 63. 

 Priejlley, Dr. Jofeph, his obfervations on different kinds 

 of air, p. 147. His defcription of Mr. Henley's new 

 electrometer, p, 259. 

 Pultney, Dr. Richard, on the medicinal virtues of a poi- 

 fonous plant, p. 469. 

 Prime numbers, how to be found, p. 328 — 332. 

 Ptarmigan, the fame bird in Europe and inAmerica, p. 390. 

 Putrefaclion, fee Air, Vegetation. 



Rrr 2 P^rmcnt 



