TERRESTRIAL MAGNETISM, ETC. 503 



The position of the Penguin' 's centre of disturb- 

 ance was Bezout Island (Beacon on summit) 

 S. 79} W. (true), distance 2-14 miles. This 

 point is 1*3 miles from the Medas centre of dis- 

 turbance. 



One general result derived from the CJiallenget 

 and other observations, that in places north of the 

 magnetic equator local disturbances are caused by 

 an excess of blue magnetism above the normal, 

 and south of that equator an excess of red mag- 

 netism, receives additional confirmation from the 

 Penguin s observations at Cossack. Such an 

 excess of red magnetism as at Cossack is at least 

 very abnormal, but the results were obtained with 

 great care and attention to detail. 



