[ 6 47 ] 
Pfo/^W of urine, produces light whh very 1Me h 
powdering phofphorus, p. 508. 1 5 5 ’ Procefs 
P^A ancient nud modern, their opinions concerning the ufe of refpiration, p. 
(Nathanael), Ef,. his adrononrical obfe, cations made in the Andrian Nether- 
lands, in the years 177-. and 17-75 n ,u, c m iNeuier- 
Planta HYTr Inf M u- /73»P-l8 2 . See J/lronomcal Obfervations. 
Planta (Mr. Jofeph), his account of the Romanlh language p 1,0 s PP r 
Flam, an infinite variety of, in the fourteen parts of Ifrica, p. f a- - 27 6-7m 
a 84 - 2 86. ?88 -s 9 o. 292, 2 93 . 296. 2 9 S. 300. 302, £ 
262 - A11 •“ particles of the platina aLfled by <L 
magnet 262, 263 Three kinds of particles of the platina, ibid. Gold pa, Lies 
o. the platina by heat run into round balls, have the appearance and quality of gold, 
p. 2 3. True Alining platina not to be melted by Sre, ibid. Fuftblc by cleflricat 
lire, 264, 265. Eledncal fire increafes its magnetical virtue, p.. z 6c,. 266. Pla^ 
tina mixed with lead lofes its magnetical virtue, p. 266. 
Polygamy, a brutal pradlice, p. 162, 163. 
Polyp e , its growth till it acquires a branched appearance, refembling a vegetable p 2 
Population, fupplement to obfervations on that of Manchefier, p. ,60. See Manche/ler. 
Population declining in this kingdom, p. 166, 167. 
Power, mechanical, an experimental examination of the quantity and proportion of 
neceffary to be employed in giving different degrees of velocity to heavy bodies* from 
a date of reft, p. 450. See Mechanical Power. 
Price (Rev. Dr.), his ihort and eafy theorems for finding, in all cafes, the difference 
between the values of annuities payable yearly, and of the fame annuities payable 
half-yearly, quarterly, and momently, p. 109. See Annuities. 
Priejlley (Rev. Dr.), his obfervations on refpiration, and- the ufe of the blood, p. 22 6. 
See Refpiration.. 
Problems, mathemati cal. 
To multiply the fquare of a given finite right line by any number, p. 79—81. 
To find a right line, the fquare on which fhall be equal to the fquare on a 
given right line, divided by any number, p. 81. 
To cut off from a given right line apart expreffed by any odd number, p. 82 
83. 
To cut off from a given right line a part expreffed by any even number, p. 84, 
8 5 » 
Propofitions felefted from a paper on thedivifion of right lines, furfaces, and folids, 
p. 73. I. If from the angles at the bafe of any right-lined triangle, right lines be 
drawn to the alternate angles of rhomhi, defcribed upon the oppofue fides, 
and applied reciprocally to the fides produced; and from the vertex* through the 
interfeftion of thefe lines, aright line be drawn to meet the bafe; the fegments 
cf the bafe, made thereby, will have to each other the duplicate proportion of the 
fides, p. 73 — 76. II, Let there be any two right lines given. There is an angle 
which 
