GAUSS'S THEOEY OF TERRESTRIAL MAGNETISM. 121 



Astronomische Nachrichten, Nos. 1792 and 1793, 

 H. Peterson has given the results derived from 610 

 measures : but the symbolical development is still limit- 

 ed (as above) to the 4th order. The results are not yet 

 exhibited in a form easily understood by the eye. 



We cannot terminate this Section of our work with- 

 out earnestly inviting the attention of our readers to the 

 whole of Gauss's investigation : one of the most beauti- 

 ful and the most important that has appeared for many 

 years in Physical Mathematics. 



