Rubber : its Sources, Cultivation, and Preparation. By Harold Brown.
(John Murray. 6s. net.)—This book is written partly for the student and partly for the planter, manufacturer, and merchant. All should find it useful, for it is well up to the standard of the admirable series in which it appears—the " Imperial Institute Series of Handbooks to the Commercial Resources of the Tropics," issued under the authority of the Secretary of State for the Colonies. Mr. Wyndham R. Dunetan points out in his preface that the plantation rubber industry has everything to gain from scientific research into the problems with which this volume deals. We note that synthetic rubber, identical in all respects with the natural product, has already been produced in various laboratories—a set of motor tyres made from it at Elberfeld have run over ten thousand miles—but Mr. Dunstan thinks that plantation rubber, if it can be profitably sold under .two shillings a pound, need not at present fear such competition.
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