SOO Royal Society. 



remansit nigra materies praedictae altitudinis duodecim palmarum. Ig-' 

 nis totam liquefecit nivem, quae ad instar rapidi torrentis tan to impetu 

 defluit, ut domus, arbores, et quicquid obviam esset secum traheret. 

 '* Sequentibusautem diebus scissa sunt aliaostia numero tredecim, 

 quae miro strepitu ignem evomebant ad instar bombardarum j longe- 

 que ab his per unum miliare cadebant ingentia saxa, quorum aliquot 

 judicata sunt ponderis ultra quindecim cantanorum. Post slrepitum 

 sequebatur odor sulphureus per aliquot miliaria in locis circumvicinis. 

 Tantus erat impetus hujus igneae materiel, ut arbores prostraret et 

 evelleret antequam eas tangerat, sique veterem materiem incendiorum 

 praeteritorura sseculorum, offendebat, earn denuo incendebat. 



'* Ex quolibet ostio profluebant amplissimi rivi, qui aliquo in loco 

 sua latitudine unum miliare occupabant, erantque altitudine duodecim 

 palmarum. 



" Duravit hie ignis per sex dies, et singula quaque nocte aspicieba- 

 tur in cacumine montis, ignis j die vero, fumus. 



*' Sed cognosci nequibat quem faceret effectum, quia illuc ascen- 

 dere non licebat propter relictam materiem incendii." 



On the Electrical Relations of Metals and Metalliferous Minerals, 

 By R. W. Fox, Esq. Communicated in a letter to Davies Gilbert, 

 Esq., F.R.S. 



The author states that he has ascertained that the crystallized gray 

 oxide of manganese holds a much higher place in the electro-magne- 

 tic scale than any other body with which he has compared it, when 

 immersed in various diluted acids, and alkaline solutions : he also 

 gives a table of the order in which other metals and minerals stand in 

 this respect. When employed in voltaic combinations he found that 

 on being so arranged as to act in opposition to one another, the di- 

 rection of the resultant of their action, as indicated by the deflection 

 of the magnetic needle, did not coincide with the mean of the direc- 

 tions of the needle when under the separate influence of each. Hence 

 he infers that the needle is not a true index of the electricity trans- 

 mitted; and that electro-magnetic action does not depend on a con- 

 tinuous electric current. He conceives, therefore, that the phseno- 

 mena are better explained on the hypothesis of pulsations which he 

 formerly advanced. A galvanometer of a new construction is em- 

 ployed by the author for weighing the deflecting force of these elec- 

 trical impulses. 



On the Circulation of the Blood in Insects. By John Tyrrell, 

 Esq., A.M. Communicated by P. M. Koget, M.D., Secretary to the 

 Royal Society. 



The observations on the circulation of the blood in insects, which 

 is a discovery of comparatively recent date, have been made almost 

 exclusively on insects in the larva state ; but the author of the pre- 

 sent paper details a variety of observations of the same fact in insects 

 which had arrived at their last or perfect stage of development. 

 Among the Myriapoda, the circulation was traced in the Geophilus, 

 and still more distinctly in the Lithobiusforficatus. The author also 

 detected the circulation, by the motion of globules, through the ner- 

 vures of tlie wings of various perfect insects, namely, of some species 



