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. 



