24-6 London Electrical Society :— Prof. Grove on a 



This was a continuation of the subject of a former paper, and 

 contained some striking illustrations of the functions of leaves of 

 growing plants, &c. 



3rd. " An Account of Experiments undertaken to investigate 

 the Nature of the Change of Colour of Bodies by Heat, and their 

 conducting Power." By Mr. Pollock. 



It is the author's object to show that the imponderable agents 

 are all one. He has this in view in all the communications which 

 he lays before the Society, and is indefatigable in gathering from 

 every source such facts as may tend to bear on the one great ob- 

 ject. How far he has been successful may be judged from a perusal 

 of his several papers. 



4th. " On the Method of restoring to weakened Magnets their 

 primitive strength." By Professor Muncke. (Translation.) 



The principle is simply to furnish the magnet with keepers in 

 proportion to its strength, and to add more as its power increases. 



5th. A Translation of an account of " Experiments made with a 

 powerful Grove's Battery. By M. De la Rive." 



Among the experiments was that of the rotation of the voltaic 

 flame in obedience to the magnet ; and the Professor's opinion on 

 the subject is thus expressed in his own words : — " That which 

 the magnet attracts or repels is that conductor formed of the series 

 of particles of carbon transported from one pole to the other, and 

 traversed by the current." 



6th. The Secretary then laid before the Society Mr. Weekes's 

 " Monthly Register for June," containing data upon several im- 

 portant points. This register will form a portion of the Society's 

 Quarterly Part of the Proceedings. 



Aug. 17. — The papers read this evening were, — 1st, " On a New 

 Electro-magnetic Machine." By Mr. B. Hill. 



The polarities of the rotating magnets were so adjusted as to 

 make available both the attractive and repulsive results, thus pro- 

 ducing a power equal to the sum of these, whereas in other ma- 

 chines the power is only equal to the difference. 



2nd. " Description of a smaller Atmospheric Electrical Appa- 

 ratus." By W. H. Weekes, Esq. 



The insulating apparatus in this is similar to that in the larger 

 apparatus already described in the Proceedings of the Society ; the 

 collecting arrangement is a pointed wire, in place of 365 yards of 

 wire. The use of such an apparatus is very limited, and not to be 

 depended on except for certain purposes. Mr. Weekes mentions, 

 that a lighted candle, in a metal candlestick insulated on wax, will 

 gather indications of electricity when other means fail. 



3rd. " Further Observations on Electrotype Manipulation : — Fu- 

 sible Metal." By Charles V. Walker, Esq., Hon. Sec. 



The author here describes the composition of fusible alloy, and 

 the mode of producing ClicMe medals, — fusible casts from fusible 

 moulds. The method is not so generally known here as on the 

 Continent ; it is very simple and effectual. Specimens were on the 



