TABLE OF CONTENTS 



INTRODUCTION. Pp. 16. 



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 List of Officers of the Smithsonian Institution 

 Table of Contents 



ARTICLE I. Observations on Terrestrial Magnetism. By Joun Locke, M. D., M. A. P. S. 

 Pp. 30. 

 VIII. Series for 1845. Cincinnati to the White Mountains 

 IX. Series for 1846. Made in the Service of the U. S. Coast Survey 

 X. Series for 1847. Lake Superior ..... 



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ARTICLE II, Researches on Electrical Rheojietry. By A. Secchi. Pp. 60, and three 

 plates. 

 Introduction ......... 



1. General Formulse for the Attraction of a Magnetic Pole on an Electric Cur- 



rent ....... 



2. Differential Formulae for Circular Currents 



3. Integration for the Differential Equations for the Circular Currents 



4. Differential Formulae for Elliptical Currents 



5. Integration of Formula for the Ellipse 



6. Discussion of the Formulae, and Equilibrium of a Magnetic Needle 



7. Application of the Formulee to Experiment 



8. Description of the Instruments used to verify the Formulae 



9. Description of the Experiments and Results obtained with the Circle 



10. Experiments with the Globe, and their Results 



11. Calculation of the Formulae 



12. Remarks on some Anomalies presented by Observation 



13. Theory of the Galvanometer 

 Conclusion ..... 

 Appendix ..... 



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* Each article is paged separately, and on the inside of each page is placed, in Roman character, the number of the 

 article to which it belongs. 



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