IV 
[ 389 ] 
LIX. Agronomical Obfervations made at the 
JJland ^Barbados ; at Willoughby Fort ; 
N and at the Obfervatory on Conftitution 
Hill, both adjoinmg to Bridge Town. By 
Nevil Mafkelyne, A. M. Fellow of Tri- 
nity College, Cambridge, and F. R. S. 
[Read December 20, 1 76^4.] 
N. B. All the obfervations of the firft fatellite of Jupiter were 
made with a two foot refledfor made by Mr. Bird, having 
an aperture of 3 -rer inches in diameter, except where 
they are marked as made with my 18 inch refledtor made 
by Mr. Short, having an aperture of four inches and an. 
half in diameter. And the eclipfes of the other fatellites 
were all cbferved with the 18 inch telefcope, except a few 
marked as made with Mr. Bird’s two foot refledtor. The la- 
titude of Willoughby Fort is 13. 0 5' N. and that of the Ob- 
fervatory 13. 0 5/ 15" N. This agrees with the latitude I ob- 
ferved when our fhip came to anchor at our firft arrival in 
Carlifle Bay, which, carefully calculated, and reduced to St. 
Michael’s Church, gives 13. 0 5/ 30" for its latitude. The 
Obfervatory is about 200 yards due eaft of the church, and 
Willoughby Fort is about 1 600 feet diftant from the lame,, 
bearing S. W, So that the Obfervatory is about 15" of lon- 
gitude, or 1" of time to the eaft of Willoughby Fort. The. 
latitudes of Willoughby Fort and the Obfervatory, fet down 
above, refult from altitudes of the fun taken with a bafon of 
quick-filver by the brafs Hadley’s fextant made by Mr. Bird, 
being calculated from them, and the apparent time known 
from equal altitudes of the fun taken with the ea^ual altitude 
inftrument.. 
At 
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