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The following curious chemical experi- ment is related by a correspondent in a lato number of the Mechanics Magazine: If a plate of pure platina be immersed in strong salphuric acid, and then washed in distilled water, and put into mixture pf oxygen and hydrogen gas. in proportions as found in water, the gases will combine gradually fill the plate. becomes red hot, and at last the gases will explode: the combined gases will run off the plate in the form of water. or escape in aqueous vapor.