THE ARGUMENT 261 



rule contemplates are in certain respects the 

 most important of characteristics. Accord- 

 ingly the above test is a valuable indication 

 of the adequacy of the preceding analysis of 

 physical and chemical properties. 



In order if possible to discover the nature 

 of such properties of matter as may have been 

 omitted in our study of fitness, I have ex- 

 amined the index of Landolt and Bornstein's 

 " Physikalisch-chemischen Tabellen," a very 

 extensive and comprehensive work. In addi- 

 tion to information regarding the arbitrary 

 units of physical science, I find mention of the 

 following properties which have not been 

 considered in the present discussion: — 



The Mechanical Equivalent of Heat. 



The Dimensions of the Angles of Crystals. 



The Refraction of Light. 



Compressibility. 



The Dimensions of the Molecules of Gases. 



Elasticity. 



The Electromagnetic Rotation of the Plane 



of Polarization of Light. 

 Color. 



Phase Rule, by which he defined the conditions of equilibrium 

 as a relationship between the number of what are called the 

 phases and the components of the system." — Findlay, 

 "The Phase Rule and its Applications." London, 1911, 3d 

 ed., p. 8. 



