Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXIX. No. 12. — December, 1903. 



CONTRIBUTIONS FROM THE JEFFERSON PHYSICAL LABORATORY, 



HARVARD COLLEGE. 



ON THE LINES OF CERTAIN CLASSES OF SOLENOIDAL 



OR LAMELLAR VECTORS, SYMMETRIOAL 



WITH RESPECT TO AN AXIS. 



By B. O. Peirce. 



