India rubber world . t which produces the Jelutongrubber, in the Peninsula, after which he gives a description ofthe product, which corresponds to that of the gum importedso largely into the United States. The Singapore market sta-tistics which reach this country also describe the material as Gutta-jeletong. It is true that Mr. Ridley, who is the di-rector of the botanic garden at Singapore, in more recent pub-lications, is less confident that Dyera costulata is the plantyielding Pontianak, but this involves no doubt that the gum isof East Indian origin. For the manufacturer, of course, thisbo
India rubber world . t which produces the Jelutongrubber, in the Peninsula, after which he gives a description ofthe product, which corresponds to that of the gum importedso largely into the United States. The Singapore market sta-tistics which reach this country also describe the material as Gutta-jeletong. It is true that Mr. Ridley, who is the di-rector of the botanic garden at Singapore, in more recent pub-lications, is less confident that Dyera costulata is the plantyielding Pontianak, but this involves no doubt that the gum isof East Indian origin. For the manufacturer, of course, thisbotanical discussion has little interest. A former dealer inNew York insisted that Pontianak was mined, and his custom-ers did not stop to argue with him. M. Fernand Vivier, after visiting Singapore and Mexico, as-sures the The India Rubber World that Pontianak andChicle are identical. Then why should Chicle sell here for tentimes as much ? April i, 1903.] THE INDIA RUBBER WORLD 231 NEW GOODS AND SPECIALTIES IN THE FISK DETACHABLE VEHICI E TIRE. T^HE method of attaching this tire to the rim is mIt depends in no way upon the air pressure in the tire,and yet the adherence to the rim is such that the tirecannot come ofl or creep until the clamping bolts hbeen removed. The tire is attached to a perfectly , which greatly simplifies matters for the wheel manufac-turer and for the makerof complete automias well. The design ofthe tire is such that thebase or the beads are heldin such position that theinner tube cannot bepinched and there is nochance, even in the handsof the most inexperienced,of any mistake being madeor of the inner tube blow-ing out when the ringsand bolts are once in place. These rings, which hold the tire inplace, have an inside angle surface, and the tire is so designedthat the beads play the part of an inside coned wedge servingtwo purposes : first, of clamping the beads together, and second,of locking the base of the tire firmly to the rim, thereby
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