with all its numerous difadvantages, did yet prove fo extremely
prejudicial to the enemy. I lhall only add, that there were taken
on board the galeon feveral draughts and journals; from fome of
which many of the particulars recited in the 10th chapter o f the
fecond book are collefted. Among the reft there was found a
j.:$f chart of all the Ocean, between the Philippines and the coaft of
Mexico, which was what was made ufe o f by the galeon in her
own navigation. A copy of this draught, corrected in fome places
by our own obfervations, is here inferted, together with the route
o f the galeon traced thereoft from her own journals, and likewife
the route of the Centurion, through the fame Ocean. This is the
chart formerly referred to, in the account of the Manila trade:
But to render it ftill more compleat, the obferved variation of the
needle is annexed to feveral parts both of the Spanijh and Englijh
track; which addition is of the greateft confequence, as no oh~
fervations of this kind in the northern parts of the Pacific Ocean
have yet to my knowledge been publifhed, and as the quantity of
that variation fo nearly correfponds to what Dr. Halley predicted!
from his Theory above fifty years ago. With this digreffion 1 lhall
end this chapter, and leave the Centurion and her prize, at anchor
off Macao, preparing to enter the river of Canton\
D d d C H A P .