Speight. — Geology of the West Coast Sounds. 267 



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Art. xxxi. — An Apparent Relation between some of the Physical Properties 



of Solids. 



By S. Page, B.Sc 



[Read before the Philosophical I nstituielof ^Canterbury, 1st December, 1909.] 



The usual conception of the mechanical structure of solids is that the finite 

 particles or molecules composing them are held together by forces of mutual 

 attraction called " cohesion." In rigid solids these forces are such that very 

 little change can occur in the relative position of the particles. The greater 

 the force of cohesion, the greater must be the counter-force necessary to 

 separate the particles, the greater the resistance to breaking-down of the 

 solid. 



This breaking-down of the solid can take place in several ways, of which 

 the following are the chief : (1) Mechanical rupture, crushing, &c. ; (2) solu- 

 tion in a liquid solvent ; (3) volatilisation, with or without fusion as a step 

 in the process. 



