Energy Relations involved in the Formation of Atoms. 723 



a result which is the same as that given by Prof. Weiss, 



since 7-7 =A. Thus the application of Van der Waals'" 



equation to magnetism leads to results which are not in 

 conflict with the kinetic theories of Langevin and Weiss. 



9. In the table which follows I have collected together the 

 values referred to in this paper of the fundamental magnetic 

 constants, the critical temperatures, and the maximum intrinsic 

 fields of the three ferromagnetic elements. The value I is 

 the maximum intensity observed at low temperatures. Like 



Van der Waals' j , to which it is analogous, it does not 



appear to be constant, but diminishes at higher temperatures. 



July 31, 1915. 



LXXVI. Energy Relations involved in the Formation of Com- 

 plex Atoms. By William D. Harkins, Fh.D., Associate 

 Professor of Chemistry in the University of Chicago, and 

 Ernest D. Wilson, S.B., Assistant in Chemistry in the 

 University of Chicago *. 



rpHE tendency, which seems to have always existed, to 

 X consider that all matter is composed of some one 

 primordial substance is now particularly strong. The idea 

 that energy, or one form of it, electricity, might be this 

 primordial substance is also not new, but until quite recentlv 

 prooMias been entirely lacking. That the mass of the 

 negative electrons is electromagnetic seems to have been 

 established by the experiments of Kaufmann and Bucherer, 

 and the recent work of Moseley on the X-ray spectra of the 



* Communicated by the Authors. 



