262 



ME. J. C. MAXWELL GAENETT 



Fig. 5. 

 (1) E 



Blue reflection from silver glass. 

 Calculated values : O- 

 spheres in glass, v = 1 56 : 



(2) E' -r- molecules in glass, v = 1 56 : 



Observed values : x . 



(3) BO ~f~ observed : 



350 -400 -450 -500 



550 -600 



650 



700 



Fig. 5. 



The continuous curve shown in fig. 5 has been fitted to the plots of these values 

 of E. . In the same figure are also shown the calculated values of E and of E/, 

 obtained from equations (15) and (17) by means of the values of a 2 +4/3 2 and of 

 a' 2 + 4/3 /2 given for silver and glass of refractive index v = I' 56 in Table II. The 

 scales on which E and E' are represented are so chosen that the ordinates corre- 

 sponding to X = '589 shall be the same as that for the continuous curve. 



