A.— MATHEMATICAL AND PHYSICAL SCIENCES. 37 



definite results, or whether we are not merely adding to the lumber of the 

 world by piling up observations from which no deductions are drawn, we 

 may answer that, though the fundamental secret of terrestrial magnetism 

 is still undiscovered, the science is progressing. . . . But there are special 

 and cogent reasons why the science of terrestrial magnetism should be 

 cosmopolitan. For those who would unravel the causes of the magnetic 

 movements of the compass needle concerted action is essential. They 

 cannot, indeed, dispense with individual initiation or with the leadership 

 of genius, but I think that all would agree that there is urgent need for 

 more perfect organisation, for an authority which can decide not only 

 what to do but what to leave undone.' 



