442 On the rapid Descent of the Barometer in October. [Dec^ 



absurd. Judging, however, from the results obtained by the 

 blowpipe, and the appearance of the precipitates, the respective 

 quantities of magnesia in Roselite and Picropharmacolite, in 

 proportion to those of the lime, must be nearly alike, but that of 

 the oxide of cobalt much greater in the former than in the latter 

 mineral. As the results obtained by M. Stromeyer do not well 

 accord with any probable atomic proportions, some error may, 

 perhaps, have crept in, in the course of his analysis, which even 

 his acknowledged ability may have failed to detect. 



Article VII. 



On the rapid Descent of the Barometer in Oct. 1824. 

 By M. P. Moyle, Esq. 



(To the Editors of the Annals of Philosophy.) 

 GENTLEMEN, Helston, Oct. 30, 1824. 



Being struck with the rapid descent of the barometer in the 

 early part of this month, and its accompaniment by a thunder 

 storm, I take the liberty in sending you an extract from my 

 meteorological journal on that occasion, and am, 



Gentlemen, your obedient servant, 



M. P. Moyle. 



