A General Index of the Pi 
nature, n. 196. p. 612. Why 
Water- Plants grow flat, ib. p. 
611. no Plants ac great depths 
in the Sea and why, n. 196. 
p. 615:. S umpire, n. 156. p. 494, 
Pliny 3 Emendations ofhim, n,i94. 
Vcly pus in the Heart, itsCaufe, Ef- 
fects and Cure, n. 1^8. p, 5-48. 
Pont EJprit. See Br idg. 
Pools bole, n. 1 j 7. p. 5*13. 
Pores in the Skin, their Figure and 
trie, n.159. p. 5*66. 
Porofity of Bodies. See Books. 
Porphyry Pillars. See Pillars. 
Pot-ajhes examined microfcopical- 
ly, n. 173. p. 1078. 
Powder. See Guns. 
Poyfons, See Orpiments. Poy- 
fbnous bites. See Teeth. Ex- 
periments of the Poyfons of 
feveral Serpents iliewn by an 
Indian, 11. 144. p. 49. 
PreJJure. See Sea. 
Priefis of Mahomet may be Secu- 
lars when they pleafe. See Der- 
vi&s. 
Primer univerfal, n. 182. p. 134. 
Primeval Eanh, n. 203. p. 890. 
Problem. See Mathematicks. 
Procefi verbal on an ancient Gaalijh 
Sepulcher, n. 185-,. p. 22.1. 
ProboJJis of Bees, n. 175. p.i 1 5- 3. 
* Projectiles their motion in a Para- 
bola, made out, n. 179. p.n. 
Prufa in Bithinia, n. 155". p. 431. 
Punishments for Robery, Murder , 
&c. among the Turks, n. 155. 
P- f 44J- , r 
Purpk-fijh, Obfervations on it, n* 
178. p. 1278. Purpura of the 
Ancients, n. 197. p. 644. 
Pyrites, wholly Sulphur, takes fire 
of itfelf is the only known Mi- 
neral yielding an inflammable 
tlofophical Tranf actions. 1023 
Vapour, the probable Caufe of 
Damps in Mines, Earthquakes, 
Thunder, &c. n. 157. p. ?i2. 
Sulphur fubllmed from Pyrites 
in /Etna, n. 169. p. 924. 
a. 
Quadratic /Equations. See Equa- 
tions and Algebra. 
Quadrature of Figures com pre- • 
hended by curve and right 
Lines improved, n. 183. p. 186. 
Quantity of Vapour raifed out of 
the Sea by the Sun, n. i8p. p. 
366. A Difcourfe of infinite • 
Quantity, n. 19$. p. 55 6. 
Quickfiher, a Difcourfe concern- * 
ing its Motion in the Barometer^ 
Whether its great Rife in frofty 
Weather is any fign either of an 
healthy or fickly Seafon? Its 
natural State whether when ex- 
panded ? Whether great Frofb- 
as well as great Warmth will 
not bring it nearer to its own 
Nature? Whether the Hu- 
mours of our Body are not af- 
ter the fame manner affe&ed ? 
The Plague and other Exotic 
Di (Tempers not caufed by the. 
W 7 eather but by Infection, n. 
i6y. p. 790. &c. See Baro- 
meter. 
Quickfiher hurtful to the Lungs,, 
n. 192. p. 486. its ufe in Re- 
fining, n. 142. p. 1052. 
Quinet what it is, n. 167. p. 
8y 4 . 
R 
