Phil. Trrvns. 1885. Plate* 61. 
i 
-H 
i 
i 
1 
j 
i 
Fi 
9- 
23. 
i 
V&~y soft ajweaZed, Iron, v/ire. 
Effects of tappuiq shown, thus - 
_ 
1 
i 
§ 49 
1 
J 
oi * 5 k 7 0 10 11 12 13 14 15 16 17 
