[ 325 ] 
true chance nearer than within the limits now deter- 
mined. But not to purfue this fubjedt any further; 
I (hall only add that the value of 2 Z may be always 
calculated very nearly, and without great difficulty ; 
for the approximations to the value of E a b\ and 
of the feries » - * 4. r !—l x — , &c. * 
3 2 n 5 
given in the Effay, are fufficiently accurate in all cafes 
where it is neceffiary to ufe them. 
* In the expreflion for this laft approximation there is an 
error of the prefs which fhould be corrected ; for the fign be- 
fore the fourth term Ihould be — and not + . 
LIII. An 
