J. Lovering on Velocity of Light and the Sun’s Distance. 163 
tons, there is a resultant motion, the direction of which deviates 
sensibly from that even of the largest motion which enters into 
the composition. In nature, the velocity of the earth is com- 
pounded, in this way, with the velocity of light, and im 
the light an apparent path differing by a small angle from the 
true pa 
are proportional to the indices of refraction inversely: which 
in the case presented are as 1 to 1:000294. This theoretical dif- 
ference of velocities is less than 37,5 of the whole, or less than 
- Compare with these conclusions of astronomy two experi- 
mental results on the same subject. Although Wheatstone’s 
experiment on the velocity of electricity, published in 1834, 
suggested the possibility of measuring, in a similar way, other 
great velocities, I shall consider first a contrivance of Fizeau, 
