176 Proceedings of the Cambridge Philosophical Society, 
but by no means in proportion to the number of plates. This 
battery was incapable of magnetising a needle inclosed in a spiral 
wire, or of exciting commotions in the limbs of a frog. An alloy 
of antimony and bismuth gave with a small compass, deviations 
in the following order : 0. 80° neg. ; 0, 80° pos. 0. — the heat 
being continued until the bar began to melt. When several 
wires were soldered to a metallic bar in different parts of its 
length, the intermediate portions being alternately hot and cold, 
there were as many opposite poles as wires. It was therefore in- 
ferred, that if the experiment were possible, there would be 
found as many poles as the bar contained atoms at different tem- 
peratures. The metallic alloys presented nothing remarkable, 
excepting that the magnetic power of bismuth was readily, but 
that of antimony was with difficulty counteracted by fusion with 
other metals. No magnetic effect was produced by heating a 
tourmaline, with silver wires coiled round its extremities. 
The general conclusion of the paper was, that the magnetic 
relations of the metals as affected by heat, have little or no con- 
nection with the galvanic relations, or their affinities for oxy- 
gen ; but are considerably dependent on the conducting powers 
of the bars, and the wires connected with them ; and that, 
therefore, any attempt to place them in a series would be incor- 
rect, unless bars and connecting wires of the same metal were 
employed. It was suggested, that a pyrometer might be con- 
structed on the principle of the magnetic deviations, being em- 
ployed as measures of temperature. 
Tables of the deviations of the different metals and alloys, at 
different temperatures, and with different connecting wires, were 
subjoined to the paper. 
May 12.' — Mr Peacock continued the reading of his paper. 
May 18.~^Being the anniversary, the Office-bearers and Coun- 
cil were elected for the ensuing year : 
President, — John Haviland, M. D. St John’s, Regius Professor of Physic. 
Vice-Presidents,- 
F. Thackeray, M. D. Emmanuel. 
Rev. W. Farish, B. D. Magdalene, Jacksonian Professor. 
Rev. J. Gumming, M. A., F. R. S., M. G. S., Trinity, Pro- 
fessor of Chemistry. 
Treasurer, — Rev. B, Bridge, B. D., F. R. S , Fellow of Peterhouse. 
