SCIEN 



A WEEKLY NEWSPAPER OF ALL THE .ARTS AND SCIENCES. 



PUBLISHED BY N. D. C. HODGES, 874 BROADW/ 



'^n. 



"'"/ir 



/*«•< 



■°.'?i 



Tenth Yeak. 

 Vol. XIX. No. 481. 



Contents. 



The Loan Collection of Objects Used 



IN Worship '325 



The Brooklyn Institute Biological 



Laboratory 32.5 



The Marine Biological Laboratory. . . 337 



HoMOPTERA Injurious to Grasses. Her- 

 bert Osborn 338 



Astronomical Notes. G. A. H 329 



Notes and News 339 



Current Notes on Anthropology. — IV. 



Edited by D. G. Brinton 230 



A Machine for Churning Fresh Milk. . 231 



The Higher Education op the Deaf. 



E. M. Gallaudet 331 



The Teaching of Science. Jas. Lewis 



Howe 333 



Letters to the Editor. 



The Question of the Celts. D. G. 



Brinton 335 



The Question of the Artificial Pro- 

 duction of Variations in Type. 

 Gerald M. West 336 



Among the Publishers 336 



Industrial Notes. 



Scientific Improvements 336 



Entered at the Post-OfBce of New York, N.Y., aa 

 Second-Class Mail Matter. 



FOR SALE. 

 SCIENTIFIC INSTRUMENTS 



AND 



GEOLOGICAL SPECIMENS. 



The instruments are second-hand, in good condi 

 tion; prices fixed are about one-half cost; they 

 were owned by the late Dr. Wm. M. Herron, of 

 Allegheny City, Pa. They will be sold separately or 

 at a reduced price in a lot. Oilers respectfully re- 

 Quested. Information and detailed list furnished 

 on application to JNO. H. HEBRON. 



1003 Penn Avenue, Pittsburgh, Pa. 

 1 Large 4-prism Spectroscope, John Browning, 



maker $175 



1 Spectograph, for recording Spectra, same 



maker 20 



1 Six-inch spark, Euhmkorff coil, same maker. 160 



1 Two-mirror Heliostat SO 



1 Large Electric Lantern, automatic slip, for 



spectrum work 35 



1 60° mnt prism, $10; 1 concave grating, $80. ... 30 



10 Geissler tubes, with rotating apparatus 86 



11 Plucker tubes 10 



18 Incandescent Electric lamps, 6 & 8 C. P 10 



1 Galvanic lamp, for use with platinum coil 2 



1 Case Mineral and Geological Specimens (per- 

 haps 700 pieces) 100 



SEASIDE STUDY OF BIOLOGY. 



THE BIOLOGICAL LABORATORY 



OF THE 



BROOKLYN INSTITUTE OF ARTS & SCIENCES 



ot Cold Spri7tg Harbor, Long Island, 

 will open its Third Season on Wednesday, July 6, and 

 will close to students on Aug. 30. Applications for 

 admission or for circulars should be addressed to 

 Prof. Herbert W. Conn, Ph D., Director, care of 

 Brooklyn Institute, Brooklyn, N. Y. 



APRIL 23, 1892. 



•^..: 



Copies, Ten Cents. 



.{.,, \r-j- I Year, in Advance 



Modern Science Series. 



Edited by Sir JOHN LUBBOCK, Bart., F. R. S. 



The works comprised in the " Moderii Science Series" are primarily 

 not for the student, nor for the young, but for the educated layman whO' 

 needs to know the present state and result of scientific investigation, 

 and vcho has neither time nor inclination to become a specialist on the 

 subject which arouses his interest. Each book is complete in itself, and, 

 while thoroughly scientific in treatment, its subject is, as far as possible, 

 presented in language divested of needless technicalities. Illustrations 

 are given wherever needed by the text. 



The following are the volumes thus far issued. Others are in prepa- 

 ration : 



THE CAUSE OF AN ICE AGE. 



By Sir Robert Ball,, LL.D., F.R.S , Royal Astronomer of Ireland, 

 author of " Starland." 13mo. Cloth, .?!. CO. 



" Sir Robert Ball's book is. as a matter of course, admirably written. Though 

 but a small one, it is a most important contribution to geology."— io)ido;i Saturday 

 Review. 



" A fascinating subject, cleverly related and almost colloquially discussed."— 

 Philadelphia Public Ledger. 



" An exceedingly bright and interesting discussion of some of the marvelous 

 physical revolutions of which our earth has been the scene. Of the various ages 

 traced and located by scientists, none is more interesting or can be more so than the 

 Ice age ; and never have its phenomena been more clearly and graphically described, 

 or its causes more definitely located, than in this thriUingly interesting volume." — 

 Boston Traveller. 



THE HORSE: A Study in Natural History. 



By William H. Flower, C.B., Director in the British Natural His- 

 tory Museum. With 27 Illustrations. 12mo. Cloth, $1 00. 

 " The author admits that there are .3,800 separate treatises on the horse already 

 published, but he thinks that he can add something to the amount of useful informa- 

 tion now before the public, and that something not heretofore written will be found 

 in this book. The volume gives a large amount of information, both scientific and 

 practical, on the noble animal of which it treats."— iV. Y. Commercial Advertiser. 



" A study in natural history that every one who has anything to do with the most 

 useful of animals should possess. The 'whole anatomy is very fully described and 

 illustrated." — Philadelphia Bulletin. 



THE OAK : A Study in Botany. 



By H. Marshall Ward, F.R.S. With 53 Illustrations. l2mo. 

 Cloth, $1.00. 



"An excellent volume for young persons with a taste for scientific studies, be- 

 cause it will lead them from the contemplation of superficial appearances and those 

 generalities which are so misleading to the immature mind, to a consideration of the 

 methods of systematic investigation." — Boston Beacon. 



" From the acorn to the timber which has figured so gloriously in English ships- 

 and houses, the tree is fully described, and all its living and preserved beauties and 

 virtues, in nature and in construction, are recounted and pictured."' — Brooklyn Eagle 



For sale by all booksellers; or will be sent by mail on receipt of price by the publishers, 



D. APPLETON & CO., 1, 3, & 5 Bond Street. New York. 



The American Geologist for 1892. 



Edited by Prof. S. Calvin, University of Iowa; Dr. E. W. CLiYPOLE, Buehtel College; John Eterman, 

 Lafayette College ; Dr. Persifor FRiZER, Penn. Hort. Soc; Prof. P. W. Ceagin. Colorado College; 

 Prof. Rob't T. Hill, U. S. Irrigation Survey: Dr. Andrew C. Lawson. University of California; R. D. 

 Salisbury, University of Wisconsin; Joseph B. Tyrrell, Geol. Sur. of Canada; E. O. Ulrich, Minnesota 

 Geological Survey; Prof. I. C. White, University of West Virginia; Prof. N. H. Winchell, University 

 of Minnesota. Now in its ISth volume. ©3 50 per year. Sample copies, yO cents. Address 



THE GEOLOGICAL PUBLISHING CO., MinneapoUs, Minn. 



SUMMER STUDY. 



Conrse of Mineralogy for Young People. 



Conducted by correspondence ; minerals and books 

 furnished. 



Collection and boot, " First Grade," one dollar; 

 postage, 25 cents. Send for circulars to 



GUSTAVE GUTTENBERG, 

 Central High School, Pittsburgh, Pa. 



Amherst Summer School 



of Languages, Art, Literature, Chemistry, Mathemat 

 ics, Library Work, History, and Political Economy. 

 Sixteenth session opens July 4, 1892. For program 

 address Prof. W. L. MONTAGUE, Amherst, Mass. 



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, H. Y. 



