DETERMINATION OF DEFLECTION OF LIGHT BY THE SUN'S GRAVITATIONAL FIELD. 323 

 are found to be 



whence 



58/+ 2-838* = -- 1 

 2-83S/ + 4-83S/c = +64 



3-238*= +64, 

 SK = +20. 



An increase of 20 on 184 corresponds to an increase of 0"-19 on l"-75. Hence the 

 resulting deflection at the limb is l"-94. 



Since the full deflection is indicated we complete the results for x by taking out the 

 remaining |E J5 obtaining d t x, and then tabulate the residuals from the mean values 

 -5942. 



The successive steps are shown below : 



(2) Comparison with Oxford Plate HI. 



The reductions are similar and are given in a rather more condensed form below. 

 The theoretical plate constants are 



b, d=+8-3, e=+38-6. 



a =+3-8, 



VOL. CCXX. A. 



2 Y 



