the Trigonometrical Operation. i j n 
Channel, at all events executed, it was therefore propofed to 
Comte de Ca ssini, who by this time had been appointed by the 
Academy of Sciences to fuperintend their part of the bufinefs, 
that he fhould fix the time that might fuit him beft for our 
meeting on the coaft ; that we would then difcontinue the ope- 
ration to the weftward, and, having in concert executed the 
coaft triangles, we would refume the inland parts of our own 
feries at fome more convenient opportunity. 
This propofition being readily acceded to by Comte be 
Cassini, the 20th of September was appointed for our re- 
pairing to the coafts of Dover and Calais refpe&ively. 
In the mean time our operation was continued* with all ima- 
ginable care and affiduity, through the firft ten ftations of 
the feries of triangles from Hampton Poor-houfe to that at 
Wrotham Hill inclufively. 
The inftrument, and the various parts of the apparatus* 
were then removed to Dover, at which place MeiT. be Cassini, 
Mechain, and le Gendre, three diftinguifhed Members of 
the Academy of Sciences, arrived on the 23d of September. 
In the courfe of two days that thefe Gentlemen honoured us 
with their company at Dover (and we regretted exceedingly 
that the latenefs of the feafon did not admit of our enjoying 
that pleafure for a much longer period) every thing was fettled 
in the mo ft amicable manner poffible, with regard to the times 
of reciprocal obfervation. 
A great number of white lights, fitted for long diftances, 
and feveral reverberatory lamps had been previoufly provided.' 
Having been fupplied with fuch a proportion of the lights as 
feemed neceffary for their fide of the channel, and one of the 
lamps, the French Gentlemen departed for Calais on the 25th, 
accompanied by Dr. Blagden, who attended them during the 
Vol. LXXX. Q time 
