SCIENCE 



Editoeial Committee : S. Newcomb, Mathematics ; R. S. Woodward, Mechanics ; E. C. Pickeeing, 



Astronomy; T. C. Mendenhall, Physics; R. H. Thurston, Engineering; Ira Remsen, Chemistry; 



J. Lb CoNTE, Geology; W. M. Davis, Physiography; Henky F. Osborn, Paleontology; W. K. 



Brooks, C. Hart Mereiam, Zoology; S. H. Scudder, Entomology; C. E. Bessey, N. L. 



Beitton, Botany; C. S. Minot, Embryology, Histology; H. P. Bowditch, Physiology; 



J. S. Billings, Hygiene ; J. McKeen Cattell, Psychology; Daniel G. Bein- 



ton, J. W. Powell, Anthropology. 



Feiday, May 26, 1899. 



CONTENTS: 



A Magnetic Survey of the Vnited States hy the 

 Coast and Geodetic Survey : De. Henry' S. 

 Peitchett 729 



The Jesup North Pacific Expedition 732 



On the Brightness of Pigments hy Oblique Vision : 

 Peofessoe Frank P. Whitman 734 



An Extension of Hetmholtz's Theory of the Heat of 

 the Sun; De. T. J. J. See 737 



On the New Genus of Lamprey Macrophthalmia Chi- 

 lensis : Peofessoe Bashfoed Dean 740 



Note on the Spawning Season of the Eel ; Eugene 

 G. Blackford 740 



Evolution of the Eminuchure in North American In- 

 dian Flageolets : E. H. Hawley 742 



■Scientific Books : — 



Angot's Traite elementaire de meteorologie : De. 

 Frank Waldo. Colliiis on the Genesis and 

 Dissolution of the Faculty of Speech : E. W. T. 

 Codex Borhonicus : M. H. Saville. Schimper's 

 Pflanzengeographie auf physiologischer Grundlage: 

 De. Feedeeick E. Clements. Victor von 

 Rlchter's Organic Chemistry: Peofessoe E. 

 Renouf. Va7i Deventer' s Physical Chemistry : 

 Peofessoe Harry C. Jones. Pools Received. 743 



.Scientific Journals and A rticles 750 



Societies and Academies : — 



The Chemical Society of Washington : Wm. H. 

 Keug. The Geological Conference and Students' 

 Club of Harvard University : J. M. Boutwell. 751 



Discussion and Correspondence : — 



Telepathy Again : Peofessoe Wm. James. On 

 the Wehnelt Current Breaker: HOWAED Mc- 

 Clenahan 752 



Thermodynamic Action of ' Steam Gas ': PEOFESSOE 

 R. H. Thueston 753 



The Removal of Dr. Wortman to the Carnegie Mu- 

 seum : H. F. 755 



-Scientific Notes and News 755 



University and Educational News 759 



MSS. intended or publication and boolis, etc., intended 

 for review should be sent to the responsible editor. Profes- 

 sor J. McKeen Cattell, Oarrlson-on-Hudson N. Y. 



A MAGNETIC SURVEY OF THE UNITED STATES 

 BY THE COAST AND GEODETIC SURVEY. 



In the plan of reoi-ganization of the ' sur- 

 vej' of the coast,' adopted in March, 1843, 

 explicit provision was made for magnetic 

 observations. 



Determinations of the magnetic declina- 

 tion wei'e made at various points along the 

 coast, under the superintendency of F. E. 

 Hassler; the real work of magnetic observa- 

 tions, however, began with Superintendent 

 Bache, who had previously made a mag- 

 netic survey of Pennsylvania and who had 

 established the first magnetic observatory 

 in this country, that of Girard College, 

 Philadelphia. 



Since that time the three magnetic ele- 

 ments, the declination, the dip and the in- 

 tensity, have been determined by survey 

 parties at various points in the United 

 States, including Alaska, and in some foreign 

 ports. 



The general charge of this work, as well 

 as the theoretical discussion which has 

 given it value, has been in the hands of the 

 Assistant Schott, Chief of the Computing 

 Division, who has called attention from 

 time to time to the need of a systematic 

 prosecution of a magnetic survey of the 

 country. It is largely due to Mr. Schott 

 and his energy in that work that the 

 present state of advancement has been 

 reached. 



In recognition of his contribution to Ter- 



