VI CONTENTS. 



Fagc 

 Art. VII. — Observations on the Arrangement and Use of the 



Bifilar Magnetometer. By Wilhelm Webeu 268 



Art. VIII. — Contributions to our Knowledge of Phytogenesis. 



By Dr. M, J. Schleiden 281 



PART VII. 



Art. IX. — Supplement to the Treatise entitled " General Theory 

 of Terrestrial Magnetism." By Carl Friedrich Gauss, 

 of the University of Gottingen 313 



Art. X. — On the Method of Least Squares. By J. F. Encke, 



Director of the Astronomical Obser\'atory at Berlin 317 



Art. XI. — On the Theory of the Formation of iEther. By 

 Heinrich Rose, Professor of Chemistry in the University of 

 Berlin 370 



Art. XII. — Determination of the Axes of the Elliptic Sj)heroid 

 of Revolution whicii most nearly corresponds with the ex- 

 isting Measurements of Arcs of the Meridian. By F. W. 

 Bessel 387 



Art. XIII. — The Galvanic Circuit investigated Mathematically. 



By Dr. G. S. Ohm 401 



PART VIII. 



Art. XIII. — (continued.) 437 



Art. XIV. — Selections from a Memoir on the Expansion of Dry 



Air. By the late Professor F. Rudberg 507 



Art. XV. — Second Series of Experiments on the Expansion of 

 Dry Air between 0° and 100°. By the late Professor F. 

 Rudberg 511 



Art. XVI. — On Barometrical Measurement of Heights. By F. 



W. Bessel 517 



Art. XVII. — On the Anhydrous Sulphate of Ammonia. By 



Heinrich Rose 551 



Art. XVIII. — On a Transportable Magnetometer. By Wil- 

 helm Weber 565 



Art. XIX — An extract from Remarks on the Term-Observa- 

 tions for 1839, of the German Magnetic Association. By 

 Wilhelm Weber 587 



Art. XX. — Resulcs of the Daily Observations of Magnetic De- 

 clination during six years at Gottingen. By Dr. B. Gold- 

 SCHMIDT 589 



