I?S 
Dr. Maskelyne's Obfervations on the Latitude 
the fouth, corrected each by their own table of refraCtions, I 
find the difference of latitude 2° 40" 32", o, 28^,9, 2 ^ 1 , 
27^,9, 2 2 /7 ,6, 28", 3, 32 /7 ,0, 26 /7 ,7, 27 /7 ,2, 24^,2, 25", 4, 
31", 3, 23 // ,2, 23", 6, 28", 9, i8",4, i6 /7 ,7, 22Y,q, 23 ,/ s 8, 
2i // ,i, 2 7", 3, 27 7/ 3, the mean of which is 2° 40' 25", 6, which, 
added to 48° ^ i 7 29", 3, the latitude of the College of Mazarine, 
gives the latitude of Gottingen 51 0 31' 54", 9, or only 2 ',3 
more than I have deduced above from M Mayer’s obferva- 
tions of the pole {tar rightly corrected, and only o /7 , 9 lefs than 
is fet down in M. Mayer’s tables, which he exprefsly fays, 
p. 48. of the precepts to his folar and lunar tables, pub! idled 
by myfelf for the Commiffioners of Longitude in 1770, was 
deduced from his own obfervations. 
I have before, when I {hewed the Abbe de la Caille’s 
refraCtions to be confiderably too great, at the tame time vin- 
dicated them as fit for his inftrument, becaufe he deduced them 
in a manner which gave him the apparent elevation of objeCts 
above their true place by the fum of refraCtion and the error of 
his inftrument, if his inftrument meafured the zenith diftances 
too fmall, as I had concluded it did. The like remark may be ap- 
plied to Dr. Bradley’s table ; for his refraCtions at the pole and 
equator, having been determined with one and the fame quadrant, 
at one time turned to the north to obferve the apparent zenith 
diftance of the pole by means of the polar ftar and other circum- 
polar liars, and afterwards to the fouth to obferve the apparent 
zenith diftance of the equator, in the manner before explained, 
muft necefl'arily be the true refraCtions, if the inftrument mea- 
fured the true angle ; and the fum or difference of the true 
refraClions and the errors of the inftrument for thefe zenith 
diftances, in cafe the inftrument did not meafure the true 
angle; and therefore equally proper to correCl his obfervations, 
whether the total arc was juft or not. 
3 
Moreover, 
