FITNESS 21 



are in form the figures of Euclidian geometry. 

 Our time flows ever in proportion to the 

 swings of a pendulum, the propagation of 

 light, and the progress of a chemical change. 

 Time and space are thus bound to matter 

 and energy by experience, and for practical 

 purposes we accept all four as science at 

 present knows them. 1 We cannot doubt 

 that knowledge of them will increase and 

 ideas of them change. But we can scarcely 

 think that our present ideas are inadequate 

 for our present purposes, or that, for life, 

 matter will ever be other than the elements 

 of the periodic classification, energy that set 

 of quantities to which we apply the laws of 

 thermodynamics, and time and space the 

 concepts which were familiar to Galileo and 

 Euclid. 



IV 



THE ORGANISM 



Thus the growth of physical science has 

 provided the speculative biologist with a 

 very accurate and extensive description of 

 the physico-chemical structure of the ma- 

 terial universe and with a well-founded con- 



1 In the present work we need have no concern for the 

 so-called principle of relativity. 



