Olservatlons on the ComVination of Metals w'Uh Sulphur. 1 -43 



this treatment of blue flame, and various shades of yellow, &c. 

 with green flame, I shall only observe in the meantime, I 

 think it very probable that the colour of flame, and particularly 

 of the lamina or border (which in that of sulphuret> of carbon 

 is a fine blue) v.ith its (the edge) w'ldth, will determine the 

 grade of /gnitio/i ; and it is my opinion that all flames have a 

 decided electrical character, which will express their relation to 

 the intensities of ignition. 



Oxygen compressed in Newman's blowpipe and passed through 

 the f,a?ne of sulphur et of carbon produces a much more violent 

 heat, than when alcohol is substituted as in Dr. Marcet's experi- 

 ment. 



I have lately made but few experiments with the compressed 

 gases in the blowpipe. I however repeated successfully 

 Dr. Clarke's experiment with the rubies ; I also fused two sap- 

 PiHRKs into ONE. In one instance I completely perforated the 

 stem of a tobacco-pipe, which the jet of inflamed gases vitrified 

 in its passage,— a stceXfle before it, literally, as Dr. Clarke ex- 

 presses it, presents " a shower of fire." In this experiment it is 

 adviseable to detach tlie bladder containing tiie mixed gases, 

 lest the sparks should ignite the explosive volume. 

 I am respectfully, sir, 



'\'our humble servant, 

 Surry Institution, Feb. 10, 1817. J, MuRRW. 



P.S. It should be stated, that when the red-hot platinum wire 

 is introduced into a wine-glass containing sulphuret of carbon, it 

 always kindles the fluid ; but it will be seen to continue red hot 

 between the surface of the fluid and the base of the flame. 



When oil is used in the cell of the blowpipe it has this disad- 

 vaiitage: the ebullition is distinguislied with much difficulty bv the 

 car ; i)Ut wiien ivnter is employed, the bubbling is very audible, — 

 and the latter is therefore a less ecjuivocal index of safety. J. .M. 



XXXVI. Olseivations on the Combination of Metals with Sul- 

 phur. By M. A. J. Frere de Montizon*. 



A . . 



XX PARTicuj,AR cxamuiation which I have made of cinnabar, 



leads me to suppose that this sulpliuret results from the con)bina- 

 t:on f)f a volume of mercury and another of sulpliur : but in 

 order to confirm my opinion in the most positive manner, I have 

 endeavoured to ascertain \vhether this mode of composition be 

 also that of other sulphurets. 



On Uiii subject I have had recourse to the analyses generally 

 • From t!ie Aiinalet de. C'/iinik- cl dv P/>)/si>jvc, for bcjitcinLcr 1B16. 



adopted. 



