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D. APPLETON AND COMPANY'S PUBLICATIONS. 



Recent Volumes of the International Scientific Series. 



'J^HE A URORA BOREALIS. By Alfred Angot, 

 -* Honorary Meteorologist to the Central Meteorological Office 

 of France. With i8 Illustrations. $1.75. 

 While there have been many monographs in different languages upon various 

 phases of this subject, there has bieen a want of a convenient and comprehensive sur- 

 vey of the whole field. Prof Angot has cited a few illustrations of each class of phe- 

 nomena, and without encumbering his book with a mass of minor details, he presents a 

 picture of the actual state of present knowledge, with a summary both of definite results 

 and of the points demanding additional investigation. 



HE EVOLUTION OF THE ART OF MUSIC. 

 By C. Hubert H. Parry, D. L. C, M. A., etc. $i.75- 



Dr. Parry's high rank among modern writers upon music assures to this book a 

 cordial welcome. It was first published as "The Art of Music," in octavo form. The 

 title of this revised edition has been slightly amplified, with a view of suggesting the 

 intention of the work more effectually. 



J J 7^ HAT IS ELECTRICITY 2 By John Trow- 

 ' ' bridge, S. D., Rumford Professor and Lecturer on the Appli- 

 cations of Science to the Useful Arts, Harvard University. 

 Illustrated. $1.50. 

 Prof. Trowbridge's long experience both as an original investigator and as a 

 teacher imparts a peculiar value to this important work. Finding that no treatise could 

 be recommended which answers the question, What is Electricity ? satisfactorily, he 

 has explained in a popular way the electro-magnetic theory of light and heat, and the 

 subject of periodic currents and electric waves, seeking an answer for his titular ques- 

 tion in the study of the transformations of energy and a consideration of the hypotheses 

 of movements in the ether. 



rCE-WORK, PRESENT AND FAST By T. G. 

 -^ BONNEY, D. Sc, F. R. S., F. S. A., etc.. Professor of Geology 

 at University College, London. $1.50. 

 In his work Prof. Bonney has endeavored to give greater prominence to those 

 facts of glacial geology on which all inferences must be founded. After setting forth 

 the facts shown in various regions, he has given the various interpretations which 

 have been proposed, adding his comments and criticisms. He also explains a method 

 by which he believes we can approximate to the temperature at various places during 

 the Glacial epoch, and the different explanations of this general refrigeration are stated 

 and briefly discussed. 



IXJOVEMENT. By E. J. Marey, Member of the 



■^^J- Institute and of the Academy of Medicine; Professor ut the 

 College of France ; Author of " Animal Mechanism." Trans- 

 lated by Eric Pritchard, M. A. With 200 Illustrations. $1.75. 

 The present work describes the methods employed in the extended development of 

 photography of moving objects attained in the last few years, and shows the importance 

 of such researches in mechanics and other departments of physics, the fine arts, physi- 

 ology and zo51ogy, and in regulating the walking or marching of men and the gait of 

 horses. 



D. APPLETON AND COMPANY, NEW YORK. 



