[ 48 3 ] 
are not far diflan t, I have examined the feveral obfer- 
vations that I can meet with made at Paris, and either 
immediately at Greenwich or in fuch parts of London 
whofe longitude from Greenwich is known within one 
fecond of time. And the refult of fuch companions 
is as follows. 
On the 29th of Odlober 1723 Dr. Halley obferved 
thefirft interior contact of the limbs of Mercury and 
the Sun at 2 h . 42 / .26 // apparent time at Greenwich. 
The Rev. Mr. Profeffor Bradley obferved the fame 
at 2 h .42 / .38 // , at Wanfled in Effex (io" to theEaft of 
Greenwich) or at 2 h .42 / .28 // when reduced to the 
meridian of Greenwich. Mr. Graham in Fleetflreet 
obferved the fame at 2 h .42 / .i9 // , or at 2 h > 42 / .44 // , 
when reduced to Greenwich. The mean of thefe 
is 2 h .42 / . 32", 7. In the obfervatory at Paris Mr. 
Maraldi obferved the fame at 2 h .5i / > 48 // apparent 
time j and Mr. Delifle at 2 h .5i / .37' / , but fufpedts it 
might have been fome few feconds later. I will 
fuppofe it to have happened at 2 h . 51'. 43", 5. 
The difference of meridians therefore is 9'. 10", 8. 
If we take a mean of Dr. Halley’s and Mr. Bradley’s 
obfervations only, the difference of meridians is 
9'- 1 b '^- 
Inthe year 1736 Dr. Bevis obferved the laft con- 
tacts of the limbs of Mercury and the Sun at 
o h 8 / -33 // at Greenwich. The fame was obferved 
at Paris by M. Maraldi and M. Cafftni de Thury, and 
at Thury by Mr. Caflini, at o h . 18' 05", 5 by a mean 
of the three obfervations. The difference of longi- 
tude therefore is 9 / .32 // ,5. 
In the year 1743 the laft internal contadl of the 
limbs was obferved by Mr. Graham in Fleetflreet at 
i h .o / .42 // , and by Dr. Bevis at Beaufort-Buildings in 
the 
