THE DUALITY OP INHERITANCE 



FIG. 6. An ordinary fern, which reproduces by asexual spores. 

 The fern is shown reduced in size at 382; a portion of a 

 frond seen from below and slightly enlarged, at 383; a 

 cross-section of the same more highly magnified, at 384. 

 Notice in 384 the sporangia, and in 385 one of these dis- 

 charging spores. (After Wossidlo, from Coulter Barnes 

 and Cowle's Textbook of Botany.) 



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