196 THE PHENOMENA OF MOTION 



pound. But it cannot be annihilated as long as the 

 arrangement of the elementary particles, by which its 

 inherent force was manifested, is not changed. 



The chemical force of sulphuric acid is present in 

 sulphate of lime as entire as in oil of vitriol. It is 

 not appreciable by the senses ; but if the cause be 

 removed which prevented its manifestation, it appears 

 in its full force in the compound in which it properly 

 resides. 



Thus the force of cohesion in a solid may disappear, 

 to the senses, from the action of a chemical force (in 

 solution), or of heat (in fusion), without being in re- 

 ality annihilated or even weakened. If we remove the 

 opposing force or resistance, the force of cohesion ap- 

 pears unchanged in crystallization. 



By means of the electrical force, or that of heat, 

 we can give the most varied directions to the manifes- 

 tations of chemical force. By these means we can 

 fix, as it were, the order in which the elementary 

 particles shall unite. Let us remove the cause (heat 

 or electricity) which has turned the balance in favor 

 of the weaker attraction in one direction, and the 

 stronger attraction will show itself continually active in 

 another direction ; and if this stronger attraction can 

 overcome the vis inertiae of the elementary particles, 

 they will unite in a new form, and a new compound of 

 different properties must be the result. 



In compounds of this kind, in which, therefore, 

 the free manifestation of the chemical force has been 



