8-4 WOODWARD 



of the solar system or the distances between the molecules of 

 a gas ; whether we seek the history of a star as revealed by its 

 light or the history of the earth as recorded in its crust ; 

 whether we would learn the evolution of man or the develop- 

 ment of a protozoon ; whether we would study the physical 

 or chemical properties of the sun or the corresponding prop- 

 erties of a grain of sand ; in short, whether we turn to the 

 macrocosm or to the microcosm for definite, verifiable knowl- 

 edge, it is found to originate in and to advance with observa- 

 tion and experiment. 



