640 Mr. pigott’s Agronomical Obfervations 
short, 18 inches focus, and fometimes an achromatic, 
treble-objed: glafs of the fame length, and not much in- 
ferior to it, made by Mr. ramsden; the times were got 
by a quadrant and a grid-iron pendulum. 
It is neceffary to mention the difference of meridians 
bet ween Paris and the places where the obfervations were 
made to which we compared our own; the more fo, as 
fome are not generally known, and others differ a fmall 
matter, from what is commonly fuppofed and printed in 
the ConhoiJJdnce des ‘ferns. 
M. messier, in communicating a confiderable num- 
ber of obfervations, informed me in a letter of the lon- 
gitudes of the following places : 
h / U 
Corbeil Raft of 11 . Obfervatory at Paris, — — o o 38 
Nolon, Mem. of Acad, of Sciences, 1764, — o 3 45 
Perinaldo, by nine correfponding obfervations of % ’s firft fatellite, o 21 33 
By a letter from Mr. mallet, 
Geneva, — - — — — o 14 40 
And by a letter on this occafion from M. Bernoulli, 
Berlin, Eaft, — - — — o 44 10 
Milan, Eaft of ditto, — — - — * o 27 24 
Peterfburg, — — - — - — i 52 o 
By the Rev. Mr. hornsby’s letter, 
Oxford, Weft of Greenwich, 4' 59"; hence of Paris, o 14 15 
By Mr. dalby’s letter, 
Mufwcl-hill, 30" Weft of Greenwich, and of Paris, 
o 9 46 
The 
