" In such cases the inductive and deductive methods of inquiry 

 may be said to go hand in hand, the one verifying the conclusions 

 deduced by the other; and the combination of experiment and 

 theory, which may thus be brought to bear in such cases, forms an 

 engine of discovery infinitely more powerful than either taken 

 separately. This state of any department of science is perhaps of 

 all others the most interesting, and that which promises the most 

 to research." SIR J. HERSCHEL, Discourse on the Study of Natural 

 Philosophy. 



