Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXVI. No. 25. — April, 1901. 



CONTRIBUTIONS FROM THE ZOOLOGICAL LABORATORY OF THE 

 MUSEUM OF COMPARATIVE ZOOLOGY AT HARVARD COLLEGE, 

 UNDER THE DIRECTION OF E. L. MARK— No. 122. 



THE DEVELOPMENT AND FUNCTION OF REISSNER'S 



FIBRE, AND ITS CELLULAR CONNECTIONS. 



A PRELIMINARY PAPER. 



By Porter Edward Sargent. 



With Two Plates. 



