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« fibres lax, and the veffels about* it immoderately 
“ diflended.” 
Ariftotle (io) exprefly fays, that timid people, and 
thofe of cold conftitutions, have large hearts ; on the 
contrary, that the bold, and thofe of a warm temper- 
ament, have fmall ones. Nor does this opinion cf 
that excellent philofopher feem ill founded ; as wo- 
men, children, and weakly men, from whom much 
courage is not looked for, are lax- fibred, and, con- 
fequently, more liable to an enlargement of this 
organ, than thofe of the human fpecies, who are 
robuft and tenfe fibred, from whom a manly exertion 
of courage is more to be expedted. 
LV. An Account of federal Experiments in 
EleEtricity : In a Letter to Mr. Benjamin 
Wilfon, F. R. S. By Edward Deiaval, 
Eff, F.R.S. 
SIR, Old Palace-yard, June 8, 1761. 
Head Dec. 17, T T appears by the experiments men- 
I761 ’ X tioned in my letter to you, publifhed 
in the fifty-firft volume of the Philosophical Tranf- 
adtions, that ftones, and other earthy fubftances, are 
convertible by feveral methods, and particularly by 
different degrees of heat, from non-eledtrics into 
eledtrics. 
(10) Lib. iii. De Partib. Animal, cap. iy. 
1 Vol. LII. Zz 
Since 
