...may be given of the phenomena pre« sented by the action of other combinations of chlorine on flame j and it is probable, that in many of those cases when...of the volatile combinations of sulphur burn with a flaine in the slightest degree opaque ; and, consequently, there is no reason, from the phenomena of...

...in its gaseous combinations without previous deposition." (P. SO, 51.) At p. 54. Sir Humphry adds, "whenever a flame is remarkably brilliant and dense,...it may be inferred that no solid matter is formed. " The heat of flames may be actually diminished by increasing their light (at least the heat communicable...

...in its gaseous combinations without previous deposition." (P. 50, 51.) At p. 54?. Sir Humphry adds, "whenever a flame is remarkably brilliant and dense,...it may be inferred that no solid matter is formed. " The heat of flames may be actually diminished by increasing their light (at least the heat communicable...

...light." Davy's final and general conclusion was that " whenever a flame is remarkably brilliant or dense it may be always concluded that some solid matter...it may be inferred that no solid matter is formed." * Phil. Mag. [v] 34, p. 371 (1892). In 1867 Dr. Frankland, lecturing before the Eoyal Institution,*...

...true solution of the problem." "Whenever a flame is remarkably brilliant and dense, it may always be concluded that some solid matter is produced in it; on the contrary, whenever a flame is extremely feeble and transparent it may be inferred that no solid matter is formed."...

...finally, Davy concluded that " whenever a flame is remarkably brilliant or dense (opaque) it may always be concluded that some solid matter is produced in it...it may be inferred that no solid matter is formed." We have seen how carbon can be produced in a hydrocarbon flame. Davy's generalization is not always...

...dense, it may always be concluded that some solid matter is produced in it ; on the contrary, whenever a flame is extremely feeble and transparent it may be inferred that no solid matter is formed." The idea that solid carbon in the flame is the source of its light was not original with Davy— he...

...as those of hydrogen and sulphur in oxygen, or of phosphorus in chlorine, etc." For, he continued, " whenever a flame is remarkably brilliant and dense,...and transparent, it may be inferred that no solid is formed." In this connection it should be noted that, although there is perhaps a latent ambiguity...

...lectures on candle flames.42 Davy investigated flames with chlorine instead of oxygen, and concluded that 'whenever a flame is remarkably brilliant and dense,...concluded that some solid matter is produced in it', noting that 'the heat of flames may be actually diminished by increasing their light'.43 He found that...

...and dense, he concludes that solid matter is always produced in it ; on the contrary, when a flame is feeble and transparent, it may be inferred that no solid matter is formed ; yet flames which produce the greatest heat, for instance, the flames of Newman's blow pipe, are so...