ON COLOURS IN METAL GLASSES, ETC. 



249 



Fig. 1. GOLD calculated values of -^- . 



A 



Fig. 2. GOLD. 

 (1) K, observed fov gold ruby glass Au(A) : 



(1) Spheres (or molecules) in vae.uo, v= 1 : (3) K, observed for gold ruby glass Au(B): - 



(2) Spheres in water at 19 C., v= 1-3333: - Observed values : . 



(3) Spheres in glass, v = 1 5 : 



Calculated values are shown thus : 0. 



(3) _, calculated for gold spheres in 



A 



glass, v 1 5 : 



Calculated values : x . 



VOL. CCV. A. 



2 K 



