Index. 49 x 
Oenanthe crocata , a poifonous plant, found to have great 
virtues in the cure of fome cutaneous diforders, p. 470, 
&c. 
P. 
Parallax tif the Sun, deduced from the obfervations of 
the laft tranfit of Venus, p. 69, &c. 
Piaralklifm of the two furfaces of the index glafs in Had- 
ley’s quadrant* neceflary for the exaCtnefs of obferva- 
tions, p. 1 1 5^ 1 id. 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. 
Percivaly Dr. Thomas, on the waters of Buxton and Mat* 
lock, p. 455. 
Perfon killed by lightning, p. 135. 
Phlogijlon , 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. Analyfed by Dr. Monro, p. 27, 28. 
Plants , in a]ftate of vegetation, prevent the alteration which 
flame produces in the air, p. 166. And rtftore it 
when vitiated, p. 163, 169. 
Porcupine quills , dyed by the natives of Hudfon’s Bay in 
red and yellow, p. 46. 
Portfmoulhy its latitude deduced from aftronomical ob- 
fervations, p. 38. 
Prenejle 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. 359. 
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 in America, p. 390, 
Putrefqflion , fee Air, Vegetation. 
Rrr 2 Pyrnmh 
