TABLE OF CONTENTS. 1 



Al'.TICLE I. INTRODUCTION. Pp. 16. 



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List of Officers of the Smithsonian Institution 



A KTICLE II. DISCUSSION OF THE MAGNETIC AND METEOROLOGICAL OBSERVATIONS MADE AT 



THE OlBARD COLLEGE OBSERVATORY, PHILADELPHIA, IN 1840, 1841, 1842, 



1843, 1844, AND 1845. Third Section, comprising Parts VII, VIII, 

 AND IX. VERTICAL FORCE. INVESTIGATION OP THE ELEVEN (OR TEN) 

 YEAR PERIOD AND OF THE DISTURBANCES OF THE VERTICAL COMPONENT OF 

 THE MAGNETIC FORCE, AND APPENDIX ON THE MAGNETIC EFFECT OF THE 

 AURORA BOREALIS; WITH AN INVESTIGATION OF THE SOLAR DIURNAL 

 VARIATION, AND OF THE ANNUAL INEQUALITY OF THE VERTICAL FORCE ; 

 AND OF THE LUNAR EFFECT OF THE VERTICAL FORCE, THE INCLINATION, AND 

 TOTAL FORCE. By A. D. BACHE, LL. D., F. R. S., Mem. Corr. Acad. 

 Sc. Paris; Prest. Nat. Acad. Sciences; Superintendent U. S. Coast Sur- 

 vey. Pp. 72. (Published May, 1864.) 



ARTICLE III. DISCUSSION OF THE MAGNETIC AND METEOROLOGICAL OBSERVATIONS MADE AT 



THE GlRARD COLLEGE OBSERVATORY, PHILADELPHIA, IN 1840, 1841, 1842, 



1843, 1844, AND 1845. Fourth Section, comprising Parts X, XI, AND 

 XII. DIP AND TOTAL FORCE. ANALYSIS OF THE DISTURBANCES OF THE 

 DIP AND TOTAL FORCE; DISCUSSION OF THE SOLAR DIURNAL VARIATION 

 AND ANNUAL INEQUALITY OF THE DIP AND TOTAL FORCE; AND DISCUSSION 

 OP THE ABSOLUTE DIP, WITH THE FINAL VALUES FOR DECLINATION, DIP 

 AND FORCE BETWEEN 1841 AND 1845. By A. D. BACHE, LL.D., F. R.S., 

 Mem. Corr. Acad. Sc. Paris; Prest. Nat. Acad. Sciences; Superintendent 

 U. S. Coast Survey. Pp. 44. (Published January, 1865.) 



ARTICLE IV. ON THE CONSTRUCTION OF A SILVERED GLASS TELESCOPE, FIFTEEN AND A HALF 

 INCHES IN APERTURE, AND ITS USE IN CELESTIAL PHOTOGRAPHY. By 

 HENRY DRAPER, M. D., Professor of Natural Science in the University of 

 New York. Pp. 60. (Published July, 1864.) 



1. Grinding and Polishing the Mirrors 



2. The Telescope Mounting .... 



3. The Clock Movement .... 



4. The Observatory . . . 



5. The Photographic Laboratory . 



6. The Photographic Enlarger .... 



PiOE 



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Each memoir is separately paged and indexed. 



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