NATIONAL GEOGRAPHIC MAGAZINE 



" J:% 



NATIONAL GEOGRAPHIC MONOGRAPHS 



On the Physical Features of the Earth's Surface, designed especially to supply to teachers and 

 students of geography fresh and interesting material with which to supplement the regular text-book. : 



LIST OF MONOGRAPHS COMPRISING VOLUME I: 



General Physiographic Processes \ 



General Physiographic Features >J. W. Powell 



Physiographic Regions of the United States - -J 



Beaches and Tidal Marshes of the Atlantic Coast Prot. N. S. Shaler 

 Present and Extinct Lakes of Nevada - Prof. I. C. Russell 



Appalachian Mountains — Northern Section - - - Bailey Willis 

 Appalachian Mountains— Southern Section C. Willard Hayes 



Mt. Shasta— A Typical Extinct Volcano - - - - J. S. Diller 

 The New England Plateau - - - . - - - - Prof. W. M. Davis 

 Niagara Falls and Its History - - - - - - G. K. Gilbert 



Price for one set of ten monographs, $1.50. Five sets to one address, $6.00. Single monographs, 30c. 



RemUwith order to AMERICAN BOOK COMPANY, 



Ne>v York - Cincinnati . Chicago 



Ripans Tabules assist digestion. 



Terrestrial Magnetism 



An International Quarterly Journal 



Edited by L. A. BAUER 

 With the Co=operation of Eminent Magneticians 



WITH the March, 1898, issue, this Journal, devoted exclusively to Terrestrial Magnetism and allied 

 subjects, such as Earth Currents, Auroras, Atmospheric Electricity, etc., entered- on its third 

 volume. The hearty co-operation extended by the workers in this promising field of investigation, as 

 abundantly shown by the numbers thus far issued, has made this Journal the international organ for 

 making known the latest achievements. The magnetic needle has become such a promising instrument 

 of research, not only in terrestrial, but in cosmical physics, that this Journal appeals to a large class of 

 investigators. The geographer, the geologist, the astronomer, the meteorologist — all are interested in 

 the development of the subject of terrestrial magnetism. It should therefore receive their support. 



Among the contributors of the main articles in the past have been Messrs. Barus, Borgen, Chree, Com- 

 mander Davis, Eschenhagen, Hellmann, Littlehales, McAdie, Rucker, Schmidt, Schuster, and de Tillo. 



Future numbers will contain : 



"The Height of the Aurora," 



By Prof. CLEVELAND ABBE. 



44 The Investigation of Hidden Periodicities in Terrestrial Magnetism 

 and Meteorology," 



By Prof. ARTHUR SCHUSTER, F.R.S. , 



44 The Relation of Terrestrial Magnetism to Geology," 



(As exhibited by recent investigations of various Authors.) 



44 Descriptions of Magnetic Observatories," 



1 Illustrated) 

 By the DIRECTORS OF THK OBSERVATORIES. 



The size of the Journal is royal octavo, a volume embracing about 200 pages. Domestic subscription 

 price : Two dollars ; single numbers, fifty cents. Foreign subscription price : Nine shillings, nine 

 marks, or eleven francs. Address : 



TERRESTRIAL MAGNETISM, 



The University of Cincinnati, Cincinnati, Ohio. 



