a piece of thepowdered metal having the same volume be substi-tuted, the explosion will occur without any heatingbeing necessary. The metals which produce, to use the expression ofthe physicists, this catalytic effect, are platinum andthose that are mined with it, such as osmium, iridium,rhodium,… … spark a motor, to mount on the piston a piece ofspongy platinum. Several attempts have been made todo this, but they have all proved abortive; and thusit is demonstrated once again that, if theory andpractice are sisters, they spend the greater part oftheir lives quarreling. The fact is that…
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