426 
Proceedings of the Royal Society 
Table II . — Observations of \lth December, 
First Series . — Discs without being polished. 
Zinc. 
Copper. 
Iron. 
Tin. 
Lead. 
105 
330 
35 
175 
+ 25 
100 
238 
45 
160 
38 
103 
256 
82 
160 
70 
112 
345 
80 
190 
Whisked 
125 
260 
65 
165 
with brush. 
107 
245 
70 
170 
160 
127 
280 
70 
150 
155 
105 
213 
95 
190 
170 
125 
265 
65 
140 
220 
115 
210 
90 
155 
138 
178 
115 
200 
140 
130 
Mean 112 ‘4 
264-2 
69-7 
165-5 
160-6 
Tin again, whisked 
repeatedly with brush 
before beginning. 
Iron again, wliisked 
repeatedly with brush 
before beginning. 
Zinc again. 
185 
80 
110 
225 
78 
125 
210 
90 
110 
210 
90 
148 
180 
120 
127 
175 
98 
132 
195 
105 
95 
170 
105 
100 
215 
90 
115 
205 
95 
120 
Mean 197 
95-1 
118-4 
Second Series . — Discs after being polished. 
Zinc. 
Copper. 
. Tin. 
Iron. 
Lead. 
+ 190 
150 
195 
50 
0 
+ 125 
180 
245 
110 
25 
+ 85 
187 
195 
88 
40 
+ 70 
160 
188 
85 
35 
Mean + 118 
169 
206 
83 
25 
Whisked. 
Whisked. 
Whisked. 
Whisked. 
Whisked. 
100 
180 
210 
88 
110 
80 
195 
160 
145 
120 
78 
240 
220 
140 
110 
90 
217 
245 
145 
80 
105 
220 
210 
120 
115 
80 
185 
240 
110 
100 
Mean 89 
206 
214 
125 
106 
