SCIENC 



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Eleventh Yeak. 

 Vol. XXI. No. 529. 



MARCH 24, 1893. 



Single Copies, Ten Cents. 

 $3.. 50 Per Teak, in Advance. 



Contents. 



The Comparative Method of Study. George 

 H. Johnson : 



Natural Selection and Use-Inheritance. 

 Victor Yarrqs 



Feeding-Lines of a LmNG Land Gastekopod 

 ON LicHENED Slate. J. B. Woodworth... 



Note on the Generic Name Chirotbs. Leon- 

 hard Stejneger 



The Ravages of Book-Worms 



Current Notes on Anthropology. — SXV. D. 

 Cf. Brinton, Editor 



The Evolltion and Use of the Aftershaft in 

 Birds. Subert Lyman Claris 



British Stone Circles. A. L. Lewis 



Physiological Contributions from Missouri 

 Botanical Garden. I. J. Christian Bay . 



162 



Letters to the Editor. 



An Alleged Mongoloid Race in Europe. 



David MacBitchie 162 



A Possible Source oJ Confusion as to the 



Origin and Character of Certain Shells. 



Henry M. Seely 163 



Book Reviews. 



A Microscopic Study of Changes due to 

 Functional Activity of Nerve Cells 163 



The Naturalist on the River Amazons. Jo- 

 seph F. James. — 163 



Text Book of the Embryology of Man and 

 of Mammals 165 



Chemical Lecture Experiments. C. P 166 



An Introduction to Qualitative Chemical 

 Analysisby the Inductive Method. C. P.. 167 



The Batrachians and Reptiles of the State 

 of Indiana 167 



The Birds of Indiana 167 



Entered at the Posi-OfHce of New Yorlc. N.'i'., as 

 Second Class Mail Matter. 



THE AMERICAN RACE. 



By DANIEL G. BRINTON, M.D. 



" The book is one of unusual interest and value."— 

 Inter Ocean. 



" Dr. Daniol G. Brinton writes as the acknowledged 

 authority of the subject.''''— Philadelphia Press. 



" The work will be of genuine value to all who 

 wish to know the substance of what has been found 

 out about the indigenous Americans.'''— i^atitre. 



"A masterly discussion, and an example of the 

 successful education of the powers of observation." 

 —Philadelphia Ledger. 



Price, postpaid, S2. 



FOSSIL RESINS. 



This book is the result of an attempt to 

 collect the scattered notices of fossil resins, 

 exclusive of those on amber. The work is of 

 interest also on account of descriptions given 

 of the insects found embedded in these long- 

 preserved exudations from early vegetation. 



By CLARENCE LOWN and HENRY BOOTH 



13°. $1. 



N. D. C. HODGES, 



874 Broadway, New York. 



o'^^^^'^lSIOlhOF MEASUREMENTS. 

 ^> ^'^^'^'-^^ W. Holman. 



8vo, cloth, I 



''.OO. 



By William Gilbert, of Col- 

 chester. A Translation by P. 

 Fleury Mottelay. Printed on an- 

 tique paper, many tail pieces, etc. 

 8vo, cloth, 425 pp. $4.00, net. 



THE VOLTAIC CELL. 

 Its Capacity and Its Con- 

 struction, embracing the results 

 of the latest investigations and 

 discoveries. By Park Benjamin, 

 Ph.D. 8vo, cloth, 562 pp. $5.00. 



JNO. WILEY &«$, NEW YORK. 



tJSEFUl, HAND-BOOKS. 



The Ornamental Penman's Pocketbook of Alpha- 

 bets, for sign-writers, engravers, stone-cutters and 

 draftsmen, 20 cts. A System of Easy Lettering, by 

 Howard Cromwell, 50 cts. Practical Electrics : A 

 Universal Haudybook on Every-day Electrical Mat- 

 ters, 135 pp.. fully illustrated, 12mo, cloth. 75 cts. 

 Notes on Design of Small Dynamo, by G. HaUiday. 

 79 pp., with a number of plates to scale, 12mo, cloth, 

 SI. The Phonograph and How to Construct It, by 

 W. Gillett. S7 pp., 12 folding plates, 12mo, cloth, S2. 

 SPON & CHAMBERLAIN, Publishers, 12 Cortlandt 

 St., New York. Illustrated and descriptive cata- 

 logues, 10 cts. 



QUERY. 



Can any reader of Science cite 

 a case of lightning stroke in 

 which the dissipation of a small 

 conductor (one-sixteenth of an 

 inch in diameter, say,) has failed 

 to protect between two horizon- 

 tal planes passing through its 

 upper and lower ends respective- 

 ly? Plenty of cases have been 

 found which show that when the 

 conductor is dissipated the build- 

 ing is not injured to the extent 

 explained (for many of these see 

 volumes of Philosophical Trans- 

 actions at the time when light- 

 ning was attracting the attention 

 of the Royal Society), but not 

 an exception is yet known, al- 

 though this query has been pub- 

 lished far and wide among elec- 

 tricians. 



First inserted June 19, 1891. No re- 

 sponse to date. 



N. D. C. HODGES, 874 BROADWAY, N. Y. 



SCIENCE 



More than one thousand of the lead- 

 ing scientific men and women of Amer- 

 ica and Europe have agreed to contrib- 

 ute to the paper during the coming year; and, 

 as others are constantly joining in this move to 

 make the paper more valuable than ever, it can- 

 not be long before there will be over tWO thou- 

 sand competent users of this weekly 

 medium of scientific discussion. 



Send 50 cents (in postage stamps, if most convenient) for two 

 months' trial subscription. 



N. D. C. HODGES, 874 Broadway, New York. 



