on an Eclipje of the Sun . 1 1 1 
with the glafs I eftimated it at firft to be about the mag- 
nitude of a ftar of the fourth order; after which it 
feemed to increafe to that of one of the third. Its firft 
appearance, to wit, that before the edge of the Sun 
emerged from that of the Moon, lafted about a minute 
and a quarter, the luminous circle was ftill vifible 
though already much weaker than it had been. 
The reddifh colour of the ring towards the Lunar 
dilk, its deep yellow 7 towards the middle, its clear and 
very pale yellow at the external extremity, its uniform 
circumference, and the rays ifluing from it to the dif- 
tance taken notice of above, convince me that the whole 
is the effect of the Lunar atmofphere, which is of a fub- 
ftance different from that of the earth, that is, more 
tranfparent, more homogeneous, more uniform, and fit- 
ter 
grandeur d’une etoile de la 4 e clafFe; et enfuite il me parut augmenter jufqu’a 
la grandeur de celles de la 3^. Sa premiere apparition, c’eft a dire avant que le 
bord du Soleil parut parcelui de la Lune, fut de la duree d’environ une minute 
et un quart : le cercle lumineux fubfiftoit encore quoique deja afFoibli. 
La couleur rougeatre de Panneau proche du dilque de la Lune. jaunatre comme 
couleur cPor vers le milieu, jaune clair et tres afFoibli vers fa partie exterieure; 
fa circonference egale, et les rayons qui partent de cet anneau a la diftance ditte 
ci deffus perfuadent que le tout eft FefFet de l’atmofphere de la Lune, laquelle 
eft de matiere difFerente de celle de la terre j plus tranfparente, plus nette, plus 
egale et plus propre a reflechir les rayons de lumiere que celle ci; autrement, 
1’anneau n’auroit pas ete egalement clair, briilant et colore dans la circonference 
entiere du difque de la lune* On ne peut pas dire que cet anneau lumineux foit 
7 FefFet 
