Tafts, fmall Italian villages, p. 171, 
Pallas , M. See ^uickjiher. 
Parent, Monf. See Reffance of the Air. 
Parker , Mr. his lens. See Phlogijlon. 
Perfitt Metals. See fnickjilver. 
' Phlogifton . See Mineral Acids. Experiments relating to, and the feeming converflon 
of water into air, by Jofeph Frietllev r , LL. D. p. 398. Different opinions concern- 
ing Phlogifton, p. 309. Experiments demonftratieg that phlogifton is the fame 
thing with inflammable air, p. coo — 405. Experiments on alkaline air and inflam- 
mable air, or phlogifton, {hewing that the fir ft is the compound, and the latter the 
more Ample fubftance of the two, p. 405 — 414. Experiments relating to the feeming 
converfton of water into air, p. 414 — 426. Experiments concerning the re con- 
verflon of air into water, p. 426. The want of analogy between the converfton of 
water into air, with other known fafts in philofophy, or in nature, accounted for, p. 
428. By the fame procefs by which refpirable air is made by means of water, in- 
flammable air may be made from liquid fubftances containing phlogifton, p. 429. 
Experiments with various liquid fubftances thrown into the form of vapour, p. 429, 
430. Experiments to afeertain the influence of the external air, p. 431, 432*. 
which could not have been made without Mr. Parker’s incomparable lens, p. 434.- 
Pigott , Edward, Efq,. See Algol . 
Plot. See Lunar Iris. 
Pregnant Woman. See Scilla. 
Pritjlley , Jofeph, LL. D. See Phlogijlon. 
^uickfher, Obfervations on Mr. Hutchins’s experiments for determining the degree of 
cold at which quickftlver freezes, by Mr. Cavendifh, p. 303. Defcription of the ap- 
paratus fent to Mr. Hutchins by the author, with remarks thereon, ibid. Striking 
circumftance in the experiments made for freezing mercury, accounted for, p. 304. 
Two other thermometers, called, for fhortnefs, wooden ones, deferibed, with their 
life, p. 306. State of the boiling and freezing points of the thermometers when they 
came back, p. 308. Difference in the pofltion of the boiling point thereon, ac- 
counted for, ibid. Dr. Black, though unacquainted with what the author had done, 
recommended nearly the fame method of determining the degree of cold, at which 
mercury freezes, p. 309. Phenomenon which occurs in the freezing of water, and is 
now found to take place in that of quickftlver, p. 310. Explained, p. 311. See 
Water, Heat, Ice. Reafon why the wooden thermometer continued finking fo long 
after the ivory one became ftationary, p. 314. Quickftlver is capable of being cooled 
below the freezing point without freezing, p. 3x5. 317. 322, Phenomenon which 
occurred 
