CONTENTS OF THE SECOND VOLUME. 



PART V. 



Page 



Art. I. — Electro-Magnetic Experiments, forming a Sequel to 



the Memoir on the Application of Electro-Magnetism to the 



Movement of Machines ; presented to the Royal Academy 



of Sciences of St. Petersburg. By M. H. Jacobi, Doctor 



of Science, and Professor at the University of Dorpat I 



Art. II — Results of the Observations made by the Magnetic 

 Association in the year 1836. Giittingen: Edited by Carl 

 Friedrich Gauss, and Wilhelm Weber 20 



1. Introduction; by Prof. Gauss 20 



2. Remarks on the AiTangement of Magnetical Observatories, and 



Description of the Instruments to be placed in them ; by Prof. 

 Weber 25 



3. Method to be pursued during the Terms of Observation ; by Prof. 



Gauss 42 



■1. Extract from the Daily Obsei'vations of Magnetic Declination 



during three years at Gottingen ; by Prof. Gauss 54 



5. Description of a small portable Apparatus for Measuring the Abso- 



lute Intensity of Terrestrial Magnetism ; by Prof. Weber 65 



6. On the Graphical Representations, and Table of Results ; by Prof. 



Gauss 87 



Art. III. — On the Combinations of Ammonia with Carbonic 

 Acid. By Heinrich Rose, Professor of Chemistry in the 

 University of Berlin 98 



PART VI. 



Art. IV. — Memoir on the Polarization of Heat. By Mace- 



DOiNE Melloni 141 



Art. V. — General Theory of Terrestrial Magnetism. By Carl 



Friedrich Gauss, Professor in the University of Gottingen 184; 



Art. VI. — On a new Instrument for the direct Observation of 

 the Changes in the Intensity of the Horizontal Portion of the 

 Terrestrial Magnetic Force. By Carl Friedrich Gauss 2.52 



