[ 414 ] 
The external contact was oblerved 
At 2*i 22 53 with a telefcope of 6 feet. 
21 22 50 - - - - - - 8 feet. 
21 22 (9 - - - - - - 1 ? feet* 
Profeffor Canterzani examined the obfervations by 
projection, and found them to agree very nearly 
with thole made in the upper chamber by Signor 
Zanotti. 
END of Par^ I. 
