316 C. F. GAUSS ON TERRESTRIAL MAGNETISM. 



the present number the maps of the Inclination and of the Hori- 

 zontal Intensity (two of each), PI. XX., XXL, XXII., and 

 XXIII., computed also according to M. Gauss's theory, and 

 not yet published in Germany. 



It is requested that the following corrections, which have 

 been kindly pointed out by M. Gauss, may be made in the 

 Translation of the " General Theory'' (Sc. Mem., vol. ii. Part vi.) 



Page 196, line 35, /or the space included by read the space com- 

 prehending. 



— 196, note, line \,for themselves read even if. 



— 202, line 21, 



for V (r^ — 2 r r") cos u cos %(^ + sin u sin m° cos (X — \°) + r" r° 

 read ^Z (r* — 2 r r° (cos u cos m° + sin u sin m° cos (X— X,*^)) + 1^ r"). 



— 204, line 4. 



In the second term of the factor of sin u^ for 



{n — rn) [n — m -\- \) , _ {n — m) (w — m— 1) 



2 [2n-\) 2 (2n-l) 



— 210, line 35, /or on seven parallels read on each of seven 



parallels. 



— 228, line 16,ybr the present century rea«? future centuries. 



— 236, line 38, /or eliminate read obtain. 



It is also requested that the following corrections may be 

 made in the magnetic papers in the Sc. Mem. vol. ii. part 5 : — 



Page 57j line 17 from bottom, /or immediately following rearf 

 nearest. 



— 80, lines 1 1 and 1 2, for B'^ - B"% read B'^ -BB". 



— 8?, last line but two, in the value of r, for + read x 



throughout. 



— 83, line 13, in the value of C,for -t- reac? x throughout. 



Reference to the Plates. 



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 : Parti. 

 XXIII. Ditto : Parts 2 and 3. 



