

C f- 



The Structure and Development 



of 



Mosses and Ferns 



{Archegon'iatae) 



3 



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. 



1928 



All rights reserved 



