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the next following in the fame direction. Suppofe, 
for inftance, a lucid point of the Sun’s furface to emit 
150 particles in one fecond, which are more than 
fufficient to give continual light to the eye, without 
the leaft appearance of intermiffion; and then the 
particles, on account of their great velocity, will be 
behind one another more than 1000 miles, and leave 
room enough for others to pafs, in all directions. 
XL VI. Ajlrono - 
