Proceedings of the American Academy of Arts and Sciences. 

 Vol. XLVI. No. 7. — October, 1910. 



CONTRIBUTIONS FROM THE RESEARCH LABORATORY OF 



PHYSICAL CHEMISTRY OF THE MASSACHUSETTS 



INSTITUTE OF TECHNOLOGY. — No. 58. 



ON FOUR-DIMENSIONAL VECTOR ANALYSIS, AND 

 ITS APPLICATION IN ELECTRICAL THEORY. 



By Gilbert N. Lewis. 



