THE 



AMERICAN NATURALIST 



Vol. XXXVII. March, rpoj. No. 435. 



ANTITHETIC VERSCS HOMOLOGOUS ALTER- 

 NATION. 1 



DOUGLAS HOUGHTON CAMPBELL. 



The nature of the alternation of generations in Archegoniates 

 is a question of fundamental importance in dealing with the 



opinion. Both the antithetic and homologous nature of the 

 alternation of generations have been supported by such eminent 

 advocates that one hesitates to speak too confidently on either 

 side. As I cannot, however, after long and careful study, agree 

 that the argument is equally strong for both sides, and it seems 

 to me that proper weight has not always been given to some 

 of the evidence, it has seemed worth while to review the direct 

 evidence on both sides as completely and as fairly as possible. 



that has already been done quite recently." I have myself given 

 fully my own reasons for supporting the antithetic theory* 



1 Read before Section G. at the Washington meeting of the A. A. A.S. 



2 Coulter: The Origin of the Leafy Sporophyte. Bot. Gaz. July, 1899. 

 : 'Campbell : Mosses ,111,/ Ferny, pp. 51C-514, 1^95- 



