^ 



Eleventh Year. 

 Vol. XXr. No. 536. 



MAECH 3, 1893. 



Single Copies, Ten Cents. 

 $3. .50 Pee Year, in Advance. 



Contents. 



Laws and Nature of Cohesion. Reginald A. 



Fessenden 113 



The Groove in the Petiole of Leaves. Aven 



Nelson 115 



The Cleansing Function of Hair. Henry Sew- 



ell 117 



Notes and News 117 



Some Points in the Comparative Osteology 



of the Tapir. Charles Earle 118 



The Speech op Children. A. Stevenson 118 



The Genesee River. Brownell Rogers 121 



Oddities in Bird Life. C. W. Swallow 121 



Telephoning by Induction, ff . H. Bryan 122 



Letters to the Editor. 



The So-Called " Cache Implements." Chas. 



C. Abbott 123 



The Largest Trees in the World. Joseph F. 



James 123 



Fern Frost. W. P. Shannon... 123 



On the Use o£ the Compound Eyes ol In- 

 sects. B.T.Lewis 124 



Among the Publishers 124 



Entered at the Post-Offlce of New York, N.Y., as 

 Second-Class Mail Matter. 



THE AMERICAN RACE. 



By DANIEL G. BRINTON, M.D. 



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

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" Dr. DaDi*^l G.Brintonwrites as the acknowledged 

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" 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.''' — Nature. 



"A masterly discussion, and an example of the 

 successful education of the powers of observation." 

 —Philadelphia Ledger. 



Price, postpaid, $2. 



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. 



PRECISION OF MEASUREMENTS. 

 By Prof. Silas W. Holman. 

 8vo, cloth, 183 pp. $2.00. 



DE MAGNETE. 

 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 im%, NEW YORK. 



USEFUI. HAND-BOOKS. 



The Ornamental Penman's Pocketbook of Alpha- 

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 SPOK & CHAJTBERLAIN, Publishers, 13 Cortlandt 

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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 Lght- 

 ning was attracting the attention 

 of the Royal Society), but not 

 an exception is yet known, al- 

 thouah 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 



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 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 

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

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