502 INDEX. 
Clock, Mr. Woolafton's account of the going of his clock, 
P- 33 r - f 
Colours , effects of lime in finking them, p. 49. of 
the eleCtric fpark drawn through wood, various ac- 
cording to its depth in the woo!, p. 419. 
Compafs , variation of, at Kittery-poinr, p. 182. 
at Portlmouth, New Hampffiire, 
p. 183. 
Compreffive force upon a fluid, how to be eflimated, p. 247. 
Proprotional to the denfity, if the abfolute elaflicity be 
conflant •, otherwife, as the denfity and abfolute elafti- 
city jointly, p. 245—248. 
Conductors eleCtrical, fuch as terminate in fharp points pre- 
ferable to blunted ones, for the fecurity of buildings, 
p. 87, 88, 133 — 152. A ball in danger of a flroke 
at a greater diffance than a point, p. 138. Particular 
inflances of the good effects of pointed conductors, 
p. 139 — 141, 147, 411, 413, 414. Points do not 
iavite a flroke of lightning, p. 13S, 142. The effeCt 
of a point fhewn by a contrivance to imitate an eleCtrified 
cloud, p. 142. The general utility of metallic con- 
ductors fhewn by an experiment of Mr. Nairne’s, 
p. 145. Preference due to points, p.410, 411. Of 
certain appearances upon the iron conductors at Sr. 
Paul’s, p. 148 — 151. Conductors for the fecurity of 
buildings befl made of lead, to terminate with pointed 
rods of copper, p. 402, 403. A new prime conductor 
of glals, p. 403. Conjectures on the phenomena of 
it, p. 405. Attempt to afcertain the conducting 
powers of different metals, 415. 
Conjecture on Aurora Boreales, p. 132. 
Confumption , a name given to many diforders to which 
that term is not properly applied, p. 72. More die of 
it, between the ages of ten and fifty, than of all other 
difeafes, ibid. Caufes of this diforder, p. 73. 
Convulfions, in children, not fo common as is generally 
imagined, p. 72. 
Copper , an ore of that refemblance, which does no: feem 
to 
