Propagation oftlie Electric Force. 2()3 



bar continues to revolve round the particles of the steel ? Does not the marked 

 difference between iron and other metals, and between steel and soft iron in the 

 same metal, show that magnetism (if electrical) must be a case of statical electri- 

 city ? What arrangement of electrified bodies may produce such a state of 

 statical power may possibly be within the reach of experiment ; but to deter- 

 mine the condition of the electrical ether in a bar of steel, is a question which, as 

 it regards the mutual actions of systems of attracting and repelling points, being 

 far beyond the reach of experiment, requires for its solution a higher, more 

 elegant, and more comprehensive instrument of research, mathematical analysis. 



