Hoyal Society. 3ll 



Of the mountains nearest to Dablin : 



Feet, 



Garrycasile, one of the highest, is 1531-7 



Three-Rock- moimta'in, adjoining the last 1247'f} 



above the level of the mad at Ballinteer, near the house 

 of Dr. Stokes, the height of which above the sea is con- 

 siderable. 



The highest point of Howtli is 567 feet 



above high water mark. 



The elevation of the plain country of KUdare, may be 

 iudged of from that of the summit level of the Grand canal, 

 by which it is crossed to the north of the hill of Allen: 

 that level being 264 feet above higii water in Dublin Bay, 

 taken from a mark made at the Pigeon- house by order of 

 the Ballast-Office. 



[To be continued.] 



XLV. Proceedings of Leartied Societies, 



ROYAL SOCIETY. 



April 9th and 10th. A. paper was read on arsenic, by 

 Dr. Lambe of King's Road, Bedford Row, communicated 

 by the late Dr. Garthshore. 



The principal object of Dr. L.'s labours on arsenic seems 

 to have been (o defend an hypothesis proposed by him, a 

 considerable lime ago, in two successive publications, 

 namely : " An Inquiry into the Origin of Constitutional 

 Diseases," and "Reports on Cancer," in which the Doctor 

 attempted to show the analogy between the action of putrid 

 matter and arsenical poison. The facts of most conse- 

 quence in the paper read as above to the Royal Society, are 

 the following : 



1. One part of charcoal was n)ixed with ten of white 

 arsenic and twenty of nitre: after deflagration, no sicns of 

 carbonic acid could be detected, as would have happened had 

 no arsenic been present. 



2. Small quantities of charcoal mixed with while oxide 

 of arsenic had the same effect as upon many other me- 

 lallic oxides, producing carbonic acid and carbonic oxide. 



3. In the reduction of arsenic by mixing white arsenic, 

 half its weight of subcavbonateof soda, and ,ith part of char- 

 coal, there appeared a peculiar gas in the early stage of the 

 proces*. It could not be inflamed by a candle, (mixed 



either 



