F. GENERAL RESULTS. 



In a treatise "Ueber die Darstellung der Ergebnisse erdmagnetischer Be- 

 obachtungen im Anschluss an die Theorie" 1 ), as also on several previous 

 occasions, Professor Dr. AD. SCHMIDT of Gotha has strongly advocated the 

 desirability, in the publication of terrestrial-magnetic investigations from 

 various quarters of the globe, of giving not only the directly observed values 

 of the three magnetic elements, but also the difference between them and 

 the theoretically calculated values for the points of observation in question, 

 as in this way the material for a more and more wide-spread improvement 

 of the theory of terrestrial magnetism would be collected. 



Dr. AD. SCHMIDT has paid the Norwegian Polar Expedition the marked 

 attention of offering to perform the arduous labour of calculating theoretically 

 the value of the magnetic elements for all the points at which magnetic 

 observations were made during the expedition, an offer which I have of 

 course accepted with very great gratitude. I am therefore enabled, in the 

 following list of all the results of the observations in chronological order, 

 to append the deviation of every single result from the corresponding theo- 

 retically calculated value. These differences (observed value minus calculated 

 value), indicated in the table as C, are not, however, really strictly correct, 

 as they contain the influence of the secular variation of the magnetic elements 

 for a period of about 10 years, the values calculated theoretically by Dr. 

 AD. SCHMIDT having reference to 1885'0, while the observations of the 



') Annalen der Hydrographie und Maritimen Meteorologie. Jahrg, XXVI, Berlin 

 1898, p. 21. 



