500 Albert P. Mathews 



being a function of molecular weight and valence, is a function 

 of the number of electron couples of the valences and atoms, 

 and is, hence, probably of a magnetic nature. Magnetic 

 substances may be supposed to be substances in which, owing 

 to the orientation of the molecules, or to their polarity, or 

 both these causes, the cohesive fields of the molecules are not 

 delimited or neutralized by the surrounding molecules so that 

 the cohesional attraction becomes apparent at more than 

 molecular distances, and under such circumstances the sub- 

 stance is said to be magnetic. 



University of Chicago 



