256 



MR. J. C. MAXWELL GARNETT 



IIK 



, Fig. 4. SILVER. 



Fig. 3. SILVER calculated values of . ,,! j * i A /D\ 



A. (1) K, observed for glass Ag (B) : 



Observed values : x . 



(1) Spheres (or molecules) in vacua, v=\-0: 



(2) Spheres in water. v=l- 3333 : 



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



(4) Spheres in glass, v = \ 6 : 



Calculated values shown thus: O- 



(2) ^-, calculated for silver spheres in 



A 



glass, v = 1 56 : 



(3) - , calculated for silver spheres in 



A 



glass, v - \ ' GO : 



Calculated values : Q . 



