[ its ] 
iouth coaft of Japan, and the fouth coafl: of Coree, 
with its diftance from Japan, and the ifland of Tou- 
yma, which, in the map of Father du Halde, is 
called Totiyla Tao , or the ifland of Touyla . It fhould 
be called Touy Ma. It is the ifle Tsutjima. It de- 
pends upon Japan. I have fpoken here with feveral 
Coreans, who have been in that ifland. 
I have already lent to you obfervations made here 
to the clofe of the year 1 7 yo, and during this year. 
I now fend you others of 1750 3 and others I inclofed 
to you at large in 1749 and 175-0. I wait for fome 
anfwer from you 3 and efpecially your opinion con- 
cerning the manner, in which I ought to difpofe my 
memoirs concerning the Chinefe aftronomy. I am 
refolved to put my lafl: hand to that work. But me- 
moirs of that kind ought to be examined by perfonS 
intelligent and zealous like yourfelf. 
At Peterfburgyou muft undoubtedly have feen what 
I wrote to Mr. Bayer about what the Chinefe have faid 
concerning the Huns and Turcs. Dr. Mortimer has 
written to me, that he had received from a nephew' 
of Monf. Fourmont a fmall piece upon the origin of 
the Turcs and Huns, as drawn from the Chinefe books, 
I fhall fpeak again ofjthat fubjedt in the memoirs, 
which I have of the hiftory of the Great Dynafty 
of Tang. There are a great number of very interefl- 
ing things upon what the Chinefe have delivered at 
that time concerning the empire of the Perflans, and 
its deflrucflion by the Mahometans 3 concerning the 
Mahometans, and the afliftance, which they gave to 
Chinefe emperors againfl: their rebels 3 concerning 
the Chriftian religion, or the Tatfm , but in very ob- 
fcure terms 3 concerning the fe< 5 ts and countries of the 
R r 2 Indians, 
