the two lately discovered celestial Bodies. 217 
comparing the diameter of Ceres with that of the lucid disk, I 
found it certainly less than the disk. By proper attention, and 
continued examination, for at least an hour, I judged it to be 
nearly f of the lucid dLk. 
Then, if we calculate as before, it appears by this observa- 
tion, in which there is great reason to place confidence, that 
the angle under which this star appeared, was only o".22. For, 
a lucid disk of 1,4 inch diameter, at the distance of 194*2 inches, 
would be seen under an angle of 2' 28", 7; three quarters of 
which are 1' 51 ",52. This quantity, divided by the power 
516,54, gives o", 21 59, or, as we have given it abridged, o",22. 
a gh y j removed the micrometer to the greatest convenient 
distance, namely, 2136 inches, and compared Dr. Olbers’s 
star, which, on account of its great altitude, I saw now in high 
perfection, with the lucid disk. It was, even at this distance, 
less than the diameter of the disk, in the proportion of 2 to 3. 
When, by long continued attention, the appearance of Pallas 
was reduced to its smallest size, I judged it to bear no greater 
proportion to the diameter of the lucid disk of the micrometer, 
than as 1 to 2. 
In consequence of these measures, it appears that the diameter 
of Pallas, according to the first of them, is 0^,17 ; and, accord- 
ing to the last, wnere the greatest possible distinctness was 
obtained, only o", 13, 
If it should appear almost incredible that these curious objects 
could give so small an image, had they been so much magnified 
as has oeen reported, I can say, that curiosity led me to throw 
the picture of Jupiter, given by the same telescope and magni- 
fymg power, on a wall at the distance of 1318 inches, of which 
it covered a space that measured 12 feet 11 inches, I do not 
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