THE PHILOSOPHY OF PHYSICS 153 



We would have liked to see how temperature is to be dealt with in 



dimensional equations. 



This very fragmentary discussion is intended to give some sUght idea 

 of the matters dealt with in this book. It cannot pretend to give a just idea. 

 The work is obviously the production of a very fertile brain, fuUy cognisant 

 of the facts of physical science. Every page teems with arguments and 

 statements which require to be taken into consideration in order to get a 

 measure of the whole. We wish it had been found possible to shorten the 

 book, especially as it is only the forerunner of several other promised volumes. 

 It must be possible to do this. The great length is largely due to each case 

 being considered on its own. It must be possible to pick out general pro- 

 positions which can be presented in an orderly fashion so as to present an 

 argument or rather a philosophy which gradually unfolds itself. This is 

 necessary in the interests of economy of thought and mental effort. Until 

 this is done, we cannot think that the book will become popular or even widely 

 read. Many wiU dip into it, however; and if they do, they will find plenty 

 of material to stimulate their own thinking. Whether they will agree with 

 the author or not is another question. We think that Dr. Campbell should 

 seriously consider this abbreviation and rearrangement before pubUshing 

 his succeeding volumes. These promise to be of even greater interest to a 

 physicist, and if would be a pity if anyone were deterred from reading 

 them simply owing to the need to economise time. 



