MECHANISM OF NATURE 



longing to the form of any atom, must be in clos- 

 est contact with two others, and while even in the 

 conjunction of two atoms, constituting a molecule, 

 there must be points or place where the several 

 spheres come into closest contact, yet there must 

 be a radical difference between atoms and molecules 

 in respect to the closest contact of their constitut- 

 ing spheres. 



In a mere mechanical mixture these points of 

 closest contact may be considered absent, and P. S. 

 in their void state may intervene. 



A classification of identities as primary (pri- 

 mary sphere), secondary (atoms), of the third de- 

 gree (molecules) and subsequent higher degrees, 

 may properly be made, as based upon the degree 

 of intimate contact of the spheres constituting the 

 identity. And in higher degrees of organization 

 into visible shapes and outlines, the contact of the 

 spheres of atoms must ever remain the closest pos- 

 sible contact. 



Therefore, etc. 



PROPOSITION X. 



In the formation of new identities, by the com- 

 bination of atoms and molecules, the primary 

 spheres are not in closest possible contact, but 

 there remain interstices between the several atoms 

 or molecules. 



Because all substances we can directly perceive 

 expand by heat, and all substances may be con- 

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