TABLE OF CONTENTS.* 



ARTICLE I. Introduction. Pp. 16. 



Advertisement .... 



List of Officers of the Smithsonian Institution 

 Table of Contents .... 



in 



ix 



xiii 



ARTICLE II. Archeology of tiie United States, or, Sketches Historical and Biblio- 

 graphical, of the progress of information and opinion respecting 

 Vestiges of Antiquity in the United States. Ey Samuel F. Haven. 

 Pp. 172. 

 Introductory note ........ 



Chapter I. General Opinions Respecting the Origin of Population 

 in the New World ....... 



Chapter II. Progress of Investigation in the United States 



Chapter III. Conclusion ....... 



3 



17 

 141 



ARTICLE III. On the Recent Secular Period of the Aurora Borealis. By Denison 

 Olmstead, LL.D., Professor of Natural Philosophy and Astronomy in 

 Yale College. Pp. 52. 

 Introductory remarks 

 Classification of Auroras 

 History of the recent secular period 

 Laws of the Aurora Borealis 

 Origin and cause of the Aurora Borealis 



3 

 4 

 5 



24 

 39 



ARTICLE IV. The Tangencies of Circles and of Spheres. By Benjamin Alvord. 

 Major United States Army. Pp. 16, and nine plates. 

 The tangencies of circles ....••• 

 The tangencies of spheres .....•• 



3 

 10 



* Each memoir is separately paged and indexed. 



