140 Miscellaneous Intelligence. 
discontinuous series of such metallic fastenings, there would be great 
- danger of the stones being displaced by the electric discharge. When 
such fastenings are used, care should be taken that they are connected 
together and with the earth by a continuous metallic conductor. Some 
persons conceived that it is desirable to insulate the conductor from the 
wall of a building by glass, but all such contrivances are absurd, since 
the distance to which the metal could be removed from the wall by 
my 
clouds to the earth. On being asked whether a flat strip of copper was K 
not better th opper rod, Prof. Faraday said the shape of the con- 
ductor is immaterial, provided the substance and quality of the metal 
are the same. 
3. On the Effect of Pressure on the Temperature of Fusion of differ- 
ent Substances; by Mr. Hopxins, (Proc. Brit. Assoc., Athen., No, 14 
—The author began by statin 
top of the substance within the cylinder, while its presence deflected @ 
small magnetic needle outside, but the instant the melting of the sub-. 
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ing force; but as these two compressing forces are equal, the friction 
Mr. Hopkins then gave the results 
following are the most important :— 
its first position: this, together with the friction is equal to the compress 
