MR. IVORY ON THE THEORY OF ASTRONOMICAL REFRACTIONS. 



225 



the French Table is questionable, both on account of the hypothetical law of the den- 

 sities, and because the quantity assumed for the horizontal refraction is uncertain. 



A few examples are subjoined, as well for explaining the use of the New Table as 

 for affording some indications of its accuracy at low altitudes. The two first in- 

 stances are taken from the Tables AstronorniqueSj and are likewise published yearly 

 in the Conn, des Temps. 



We may now inquire how far the refractions are likely to be affected by the term 

 which it was found necessaiy to leave out, because the present state of our know- 



MDCCCXXXVIII. 2 G 



