Phil. Mag. S. 6. Vol. 2. PI. IX. 



"I 



m r~^- 



1 



* ^ jgj ^ ^ 



Figure 10. Potassic iodide ; 580 diam. ; exposure 0-17 sec. 



Figure 11. Potassic iodide ; 580 diam. ; exposure 025 sec. 



i 



Figure 12. Potassic iodide; 580 diam.; exposure 017 sec. 



1 ^ 



Figure 13. Potassic iodide ; 580 diam. ; exposure 17 sec. 



Figure 14. Potassic iodide ; 580 diam. ; exposure 0\L7 sec. 



Figure 15. Potassic iodide ; 5^0 diam. ; exposure 0*17 sec. 



