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74 THE BOOK OF THE LANTERN. made of quick lime, and moisture will slake them. Lime cylinders are difficult things to keep, for damp air will get to them in spite of ordinary precautions. I have tried to preserve them—with partial success—by dipping each cylinder separately into a solution of indiarubber in ben- zole or chloroform, which forms a skin upon its surface. An American writer publishes a better plan. He melts some solid paraffin or bees' wax in a metallic vessel, exercising care that the heat is just enough to render the substance liquid and no more. He then dips each cylinder into the wax half way, allows it to cool, and then holding it by its waxed end, dips the other half. This coating, he says, quite excludes the air, and the limes may be rolled in paper and packed away until'wanted for use. The coating is readily peeled off when the lime is required for the lantern, provided that the heat employed in melting the wax was not too high when the cylinders were dipped. Each lime is cylindrical, and about one inch and a half in length, with a central hole for the reception of the pin upon the jet. This hole should be carefully freed of powdered lime, by running a match through it, after which the cylinder can be placed upon its pin, where for the present we will leave it. As already indicated, the most commonly used form of lime jet is the safety, or blow-through kind. If the jet be a properly-constructed one, it will well illuminate a picture 15 feet in diameter. In this jet the hydrogen is sup- plied from the nearest household source, by a connecting tube of india-rubber. Herein lies, perhaps, its only dis- advantage. In an ordinary house the connexion is an