[ 263 ] 
in it, and that it has fome dry cavities, which fink 
below the difk. Thefe two remarks, having been 
thought curious by Mr. Le Monier, and Mr. Caffiny, 
I have taken the liberty to communicate them to you 5 
and have the honour to be. 
My Lord, 
Your Lordfhip's 
mofl obedient humble Servant, 
Le Prince de Croy, 
Obfervation of the Eclipfe of the Sun , of the 1 6th of 
Auguft 1765, at Calais, near the Steeple , in the fame 
Place , where the central and annular Eclipfe was 
obferved. 
Beginning - 3 h 50' 46 
End - - - - 5 8174 
Theduration, of which lam very certain 1 17 314 
The greateft magnitude was of 2 dis * 50™'"* 
The points of ingrefs and egrefs are marked as they 
appeared to us in the three refrading telefcopes, two 
of which had very nice micrometers, and in the large 
* This might have happened i" 1 fooner, viz. at 45", on ac- 
count of the uncertainty of the ingrefs. I, however, think the 
former determination juft, becaufe I, at that inftant, was pointing 
with the great refra£tor towards the fpot, where the moon entered, 
and I was ftruck with the fuddennefs of the ingrefs of the 
penumbra* 
refrador* 
