Established by Edward L. Youmans APPLETONS' POPULAR SCIENCE MONTHLY EDITED BY WILLIAM JAY YOUMANS VOL. LIV NOVEMBER, 1898, TO APRIL, 1899 NEW YORK D. APPLETON AND COMPANY 1899 COPYRIGHT, 1899, BY D. APPLETON AND COMPANY. VOL. LIV. ESTABLISHED BY EDWARD L. YOUMANS. NO. 6. APPLETONS' POPULAR SCIENCE MONTHLY. APRIL, 1899. _EDITED BY WILLIAM JAY YOUMANS._ CONTENTS. PAGE I. The Stuff that Dreams are made of. By HAVELOCK ELLIS 721 II. The Best Methods of Taxation. By the Late Hon. DAVID A. WELLS. Part I 736 III. Mental Defectives and the Social Welfare. By MARTIN W. BARR, M. D. (Illustrated.) 746 IV. The Wheat Problem again. By EDWARD ATKINSON 759 V. The Coming of the Catbird. By SPENCER TROTTER 772 VI. Guessing, as Influenced by Number Preferences. By F. B. DRESSLAR 781 VII. Concerning Weasels. By WILLIAM E. CRAM. (Illustrated.) 786 VIII. Care of the Throat and Ear. By W. SCHEPPEGRELL, M. D. 791 IX. The Physical Geography of the West Indies. I. The Mammals of the Antilles. By Dr. F. L. OSWALD 802 X. Iron in the Living Body. By M. A. DASTRE 807 XI. The Malay Language. By Prof. R. CLYDE FORD 813 XII. Life on a South Sea Whaler. By FRANK T. BULLEN 818 XIII. Sketch of Manly Miles. (With Portrait.) 834 XIV. Editor's Table: Science and Culture.--Survival of the Fittest 842 XV. Scientific Literature 845 XVI. Fragments of Science 854 XVII. Index to Vol. LIV 865 NEW YORK: D. APPLETON AND COMPANY, 72 FIFTH AVENUE. SINGLE NUMBER, 50 CENTS. YEARLY SUBSCRIPTION, $5.00. COPYRIGHT, 1899, BY D. APPLETON AND COMPANY. Entered at the Post Office at New York, and admitted for transmission through the mails at second-class rates. [Illustration: MANLY MILES.] APPLETONS' POPULAR SCIENCE MONTHLY. APRIL, 1899. THE STUFF THAT DREAMS ARE MADE OF. BY HAVELOCK ELLIS.