Proceeding's of the American Academy of Arts and Sciences. 

 Vol. XXXVIII. No. 24. — May, 1903. 



CONTRIBUTIONS FROM THE JEFFERSON PHYSICAL LABORATORY, 



HARVARD COLLEGE. 



ON FAMILIES OF CURVES WHICH ARE THE LINES 



OF CERTAIN PLANE VECTORS EITHER 



SOLENOIDAL OR LAMELLAR. 



By B. O. Peirce. 



