SCIENCE. 



Editorial Committee : S. Newcojib, JIathematics ; R. S. Woodwakp, Mechanics ; E. C. Pickering, As- 

 tronomy ; T. C. JIexdexhall, Physics ; R. H. TllUKSTON, Engineering ; IBA Remsen, Chemistry ; 

 Joseph Le Coxte, Geology; W. M. Davis, Physiography; O. C. Maesh, Paleontologj' ; W. K. 

 Brooks, Invertebrate Zoology ; C. Hart Merriam, Vertebrate Zoiilogy ; N. L. Bkittox, 

 Botany ; Hexry F. Osborx, General Biologj- ; H. P. Bowditch, Physiology ; 

 J. S. Billings, Hygiene ; J. McKeen Cattell, Psychology ; 

 Daniel G. Brixton, J. W. Powell, Anthropology. 



Friday, Ja>tjabt 11, 1895. 



COXTEX^TS: 



On lite JIagniUtde of the Solar Si/stem : WiLLIAJl 

 Harkness ". -'9 



Till- Baltimore Meeting nf the Ameriraii Sociiii/ (if 

 XtilKralints: W. A. Setchell, Secretary :?4 



The I'rineeton Meeting of the American I'si/ehologieal 

 Axfoeiation : J. McKeen Cattell, Secretary. . .42 



Current Xolex on Anthrnpulngy; Xeic Series, I.: D. 

 G. Brinton 47 



Hygiene : — 48 



The Xew Serum Treatment of Diphtheria ; Oys- 

 ter/) as a Jfeans of Tiniismitling Typhoid Fever. .49 



The Emiution of Invention ; O. T. MASON .50 



Scientific Literature : — 50 



Kelrin^s Popular Addresses : T. C. Mendenhall. 

 Laws of Temperature Control of the Geographic 

 Distribution of Life. Lamson-Seribner' s Uraxsis 

 of Tennessee : N. L. B. 



Notes : — 55 



Physics ; Personal ; Zoology ; Xew Piibliealinns. 



Societies and Academies 56 



Xew Books 56 



MSS. intended for publication and books, etc., intended 

 for review should be sent to the responsible editor, Prof. J. 

 McKeen Cattell, Garrison on Hudson, N. Y. 



Subscriptions ( five dolliirs annually ) and advertisements 

 should be sent to the Publisher of Science, 41 East 49th St., 

 New York. 



ON THE MAGNITUDE OF THE SOLAR SYSTEM.* 

 Nature may be studied in two widely 

 different ways. On the one hand we may 

 employ a powerful microscope which will 

 render visible the minutest forms and limit 

 our field of view to an inlinitesimal frac- 



*Part of the Address delivered before the American 

 Association for the Advancement of Science at its 

 Brooklyn meeting, August 16, 1894, by the retiring 

 President, Professor Harkness, and reprinted with 

 his permission. 



tion of an inch situated within a foot of our 

 own noses ; or on the other hand, we may 

 occupy some commanding position and from 

 thence, aided by a telescope, we may ob- 

 tain a comprehensive view of an extensive 

 region. The first method is that of the 

 specialist, the second is that of the pliilos- 

 opher, but both are necessary for an ade- 

 quate understanding of nature. The one 

 has brought us knowledge wherewith to de- 

 fend ourselves against bacteria and microbes 

 which are among the most deadly enemies 

 of mankind, and the other has made us 

 acquainted with the great laws of matter 

 and force upon which rests the whole fabric 

 of science. All nature is one, but for con- 

 venience of classification we have divided 

 our knowledge into a number of sciences 

 which we usually regard as quite distinct 

 from each other. .-Uong certain lines, or 

 more properly, in certain regions, these 

 sciences necessarily abut on each other, and 

 just there lies the Aveakness of the special- 

 ist. He is like a wayfarer who always 

 finds obstacles in crossing the boundaries 

 between two countries, while to the trav- 

 eler who gazes over them from a command- 

 ing eminence the case is quite difterent. If 

 the boundary is an ocean shore there is no 

 mistaking it ; if a broad river or a chain of 

 mountains it is still distinct ; Init if only a 

 line of posts traced over hill and dale, then 

 it becomes lost in the natural features of 

 the landscape, and the essential unity of the 



