[ *6i ] 
of cape Romana, whereas it was nearly to the weft 
of it. The fecond error was in protrading the eaft 
fide of the bay of Siam 1 8 degrees farther than the 
land at prefent exifts. And it will immediately ap- 
pear in what manner this happened. 
The boundaries of the Sinre to the weft, is in his 
173 degree of longitude, and the moft fouthern end 
of that parallel, in the 17th of north latitude f . Cat- 
tigara in the 177th and 8th of fouth latitude s. This 
difference was the whole maritime extent of the 
country. In his defcription of the weft fide of the 
bay, he had confumed 13 degrees of longitude, that is 
from cape Romana to the bottom where the land 
began to refled fouth ; and thefe are what he allow- 
ed for the 20 days failing already mentioned ; there 
were only 4 degrees remaining between the bottom 
of the bay and Cattigara ; but, as that would not at 
all agree with the accounts he had received of its 
being a great bay, when one fide was fo much fhort- 
cr than the other, he might think his firft explana- 
tion of the word Jome, erroneous more efpecially as 
the other fignification that was given, which was to 
take it for many , even fo many , that they could not 
be numbered, would intirely coincide with his firft 
f Lib. vii. cap. 2. 
s Lib. vii. cap. 3. It has been a prevailing opinion that Aga- 
themerus made thefe tables we have annexeu to j. tolemy s geo- 
graphy, but this appears only to have been done in conftquence 
of the longitudes and latitudes Ptolemy had fettled, ror when 
we fee him fall into lo great an error in his firft book, which 
none doubts to be his own, the adding thefe fuppofititious 17 de- 
grees to .the longitude ol the earth 5 why may we not with as 
much appearance oi juftice lay this fecond fault to his charge, 
efpecially as we have no proofs to the contrary ? 
Vol. LVII. Y Theory. 
