Consequently, If It Can Be Proved
That The Map Obtained By Dr. Vincent Is Genuine, It Must Have Existed
Previous To The Portuguese Discoveries.
The proof of the genuineness of the
map is derived from the date on the planisphere, 1459; the internal
Evidence on the work itself; and the fact that Alphonso, or Prince Henry of
Portugal, who died in 1463, received a copy of this map from Venice, and
deposited it in the monastery of Alcobaca, where it is still kept. The sum
paid for this copy, and the account of expenditure, are detailed in a MS.
account in the monastery of St. Michael.
The third, and by far the most important part of Dr. Vincent's
dissertation, examines what the map contains respecting the termination cf
Africa to the south. On the first inspection of the map it is evident, that
the author has not implicitly followed Ptolemy, as he professes to do. The
centre of the habitable world is fixed at Bagdat. Asia and Europe he
defines rationally, and Africa so far as regards its Mediterranean coast.
He assigns two sources to the Nile, both in Abyssinia. On the east coast of
Africa, he carries an arm of the sea between an island which he represents
as of immense size, and the continent, obliquely as far nearly as the
latitude and longitude of the Cape of Good Hope. This island he calls Diab,
and the termination on the south, which he makes the extreme point of
Africa, Cape Diab.
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