TERRESTRIAL MAGNETISM. 189 



should in all cases be made with one set of instruments and by the 

 same methods. Whether the British Association, which for so long 

 managed a magnetic observatory, may think that it could usefully inau- 

 gurate the work it would be improper for me in a presidential address to 

 forecast. Who does it is of less importance than that it should be done, 

 and 1 can not but hope that the arguments and instances which 1 have 

 to-day adduced may help to bring about not only the doing of the work, 

 but the doing of it quickly. 





