INDEX. 5 6 7 
Watfon , Rev. Mr. Robert, his experiments on the fo- 
lution of lairs, p. 325. 
Wheel barometer, invented and improved by Mr. Fitz 
Gerald, p. 74, 75. Its exadlnefs and ufes, p. 77, 78. 
Winckeijea , Earl of, his account of the eruption of mount 
Etna, in 1669, p. 4. 
Wrnn , Captain, his account of the efFtdt of lightening on 
a conductor fixed to the mainmaft of his fnip, p. 183. 
Winthrcp , John, Efq-, his letter on the retardation in the 
times of the tranfit of Venus occafionea by the aber- 
ration of light, p. 358. 
Wood expanded or contracted by a lefs or greater degree 
of heat, p. 223. 
V/oolcombe , Mr. Thomas, his letter on a boy who died of 
a gun-ihot wound, p. 94. 
The End of the Sixtieth Volume. 
jV. B. The Number of Copper Plates belonging to 
this Volume is TWELVE. 
