[ 8 9 ] 
too much ; for, fuppofing an error in my run from 
fhore to Ihore io miles, it would only make the 
diftance 50 miles, which is 25 or 30 miles lefs than 
the charts give. 
Latitude obferved at Mocha 13 0 23' N. 
Variation of the c®mpafs 12 0 33' W» 
Vol. LXII. 
N 
XII. An 
