The Structure and Development 



of 



Mosses and Ferns 



(Archegoniatae) 

 THIRD EDITION. REVISED AND ENLARGED 



BY 



DOUGLAS HOUGHTON CAMPBELL, Ph.D. 



Professor of Botany 



IN THE 



Leland Stanford Junior University 



THE MACMILLAN COMPANY 



London: Macmillan & Co., Ltd. 



1918 



All rights reserved 



