The Structure and Development 



of 



Mosses and Ferns 



i^Archegoniatae) 



THIRD EDITION, REVISED AND ENLARGED 



BY 



DOUGLAS HO'UQHTON CAMPBELL, Ph.D. 



Professor of Botany 

 LfiwAnd Stanford Jjnior UnfvejvSity 



■J < t) •' '^ * 



1 » .^ .J - . ^' 







• - . 



THE MACMILLAN COMPANY 



London : Macmillan & Co., Ltd. 

 1918 



All ri^hfs reserved 



