1883.] 



on the Size of Atoms. 



199 



gated through it, as are waves of light in the lumiuiferous ether. 

 Gravity is the inconvenient accident of our actual position which 

 prevents my showing it to you here just now. But instead, you have 



Fig. 4. 



Fig. 5. 



Twelve particles in Wave-Length. 



these two wave-models (see Fig. 2), each of which shows you the 

 displacements and motions of a line of particles in the propagation 



