LIST OF THE PLATES IN VOL. II., 



TO ILLUSTRATE THE FOLLOWING MEMOIRS. 



Plate I. Prof. Jacobi's Experiments on the application of 

 Electro-magnetism to the Movement of Machines. 

 II. to X. Gauss and Webeu on Terrestrial Magnetism. 

 XI. and XII. Gauss on the General Theory of Terrestrial Mag- 

 netism. 



XIII. Gauss on the changes in the Intensity of the Hori- 



zontal portion of the Terrestrial Magnetic Force. 



XIV. Weber on the Arrangement and Use of the Eifilar 



Magnetometer. 

 XV. and XVI. Schleiden on Phytogenesis. 

 XVII. to XXIII. Gauss on Terrestrial Magnetism : — 



XVII. Map of the Lines of Declination. 

 XVIII. Map of the Lines of Total Intensity : Part 1. 

 XIX. Ditto : Parts 2 and 3. 

 XX. Map of the Lines of Inclination : Part 1. 

 XXI. Ditto : Parts 2 and 3. 



XXII. Map of the Lines of Horizontal Intensity : 

 Part L 

 XXIII. Ditto: Parts 2 and 3. 

 XXIV. Ohm on the Galvanic Circuit. 

 XXV. Weber on a Transportable Magnetometer. 

 XXVI. Weber on the Term-Observations for 1839 of the 

 German Magnetic Association. 



