The Rev. De. Robinson on the Constant of Refraction. 227 



Example. 

 Fomalhaut, zen. dist. 84° 39'. 46 ; e. t. 42° ; bar.' 30\148 ; a. t. 46M. 



tang z. D. . 1.02913 c — 62.56 



A. . 0.29557 (d) + 0.25 = _ 8' X — 0.031 



B. 4- 15 (e) — 1.01 = 4- 0.548 X — 1 -95 

 30.148 1.47926 —63.38 



2.80411 636.96 = r' 



573.58 = R. 



The Reader is requested to make the following Correction :- 

 Page 223, last line, /or 1 + read 1 — . 



2g2 



