[ i6i ] 
Paris. I have, therefore, extracted from the Philo* 
fophical Tranfadions, and the Memoirs of the Roy- 
al Academy at Paris, the feveral obfervations of the 
four tranfits of Mercury over the Sun in the years 
J 7 2 3> j 73 6 > 743» and 1 753 - 
The obfervations in the year 1723, were made by 
Dr. Halley at Greenwich, by Dr. Bradley at Wan- 
ted, and by Mr. George Graham at London, by 
meffieurs Caffini, Maraldi, and De L’ifle at Paris. 
Thofe in the year 1736, were made by Dr. Bevis at 
Greenwich, and by meffieurs Caffini and Maraldi at 
Paris. Thofe in the year 1743, were made by mef* 
lieurs Caffini, Maraldi, Le Monnier and de la Caille 
at Paris, and by Dr. Bevis and myfelf at Mr. Gra- 
ham’s houfe in Fleet-ftreet, London. Thofe in the 
year 1753 were made by meffieurs Caffini, Bouguer, 
de L ille, Merville, Libour, le Gentil, and de la 
Lande at Paris, and by Dr. Bevis and myfelf in Sur- 
ry-ftreet, London. 
By means of thefe obfervations, I have got no lefs 
than 63 determinations of the difference of longitude 
between the royal obfervatories of Greenwich and 
I aris, and having corrected them by parallax, they 
are as follows. 
Vol. Lin. 
z 
1723 By 
