PHILOSOPHICAL 
MEMOIRS. 
PX Ee. 
ASTRONOMICAL AND MATHEMATICAL 
PAPERS. 
E. uf euh Ad oen f the Altitud: and Login of the "on- 
Ps dringt rhe Di omes "n Meridiahs te en. marred. 
Hall, in the Univerfity of Cambridge, in the Commonwealth of 
Maffachufetts, and the Royal Obfervatories at Greenwich and 
Paris. Jn a Letter from the Reverend Joserpu WILLARD, 
Prefident of the Unroerfity, and Correfponding Secretary of 
the American' Academy of Arts and Sciences, to the Honorable 
James Bowpoin, L. L. D. Prefident of the Academy. 
SA. R, 
S the parallaxes of the "ERR in latitude and longitude 
come frequently into wfe, in aftronomical calculations, 
and particularly in deducing the difference of meridians be- 
tween one place and another, from correfponding obfervations 
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