i6S Dr, Maskelyne’s Obfervations on the Latitude 
at the pele and equator. Whence the ref ration at the pole 
will be found in like manner as before 44^,3, and that at the 
equator i' 9^,9, and the latitude 51 0 28' 39 ",7, and the re- 
fraction at the apparent zenith diftance of 45 0 3 / ~55' / ,8, 
which is 1 /7 , 2 lefs than Dr. Bradley’s determination, and i'\z 
greater than deduced from Mr. Hawksbee’s experiment of the 
refraction of the air hereafter cited. It will be fhewn in the 
fequel, that the latitude thus found does not at all depend on the 
truth of the total arc, but only fuppofes the inftrument pro- 
portionally divided at the points anfwering to the pole and 
the equator. 
From the whole then I conclude, that the latitude of the 
Royal Obfervatory at Greenwich is firmly eftablifhed from Dr. 
Bradley’s obfervations and my own at 51 0 2$' 40 // , probably 
without the error of a fingle fecond. 
Let us now inquire into the latitude of the Royal Obferva- 
tory at Paris. M. le Monnier, in the Memoires of the Royal 
Academy of Sciences for 1738, and in his Hijloire Celejte, has 
examined into the latitude of the Royal Obfervatory at Paris, 
refulting from the obfervations of the principal French aftro- 
nomers, and affuming the refraClion at the height of the pole 
at Paris to be 50", which is 2" lefs than Dominico Cassini’s 
table gives, and the fame which Dr. Bradley’s rule gives, 
he finds the latitude of their Royal Obfervatory as follows : 
# o / /t 
From the obfervations of M. Picard * 48 50 10 
of M. de la Hire - 48 50 12 
le Chev. de Louville 48 50 8 
— — M. Maraldi - 48 50 14 
His 
