INTRODUCTION. 1 



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instrument available, but rather to carry it with us, and to 

 use it as not abusing it. 



And this, as I have said, is what I shall endeavour to do. 

 No one can regret more than myself that the most interesting 

 of all regions of scientific enquiry should happen to be the 

 one in which experiment, or inductive verification, is least 

 of all applicable ; but such being the case, we must take the 

 case as we find it, use deductive reasoning where we clearly 

 see that it is the only instrument available, but use it to as 

 limited an extent as the nature of our subject permits. 



