24 SEX AND HEREDITY 



and a Flowering Plant, as exemplifying the highest point 

 reached in the. Evolution of Plants. 



Antheridia and spermatozoids of a Fern (Nephrodium). 4, 5, Mature antheridia 

 containing spermatocytes ; 6, rupture of an antheridium in water, and escape 

 of the spermatozoids ; 8, a single spermatozoid more highly magnified. (After 

 Kny.) 



A Fern is a large leafy plant, and familiar examples 

 are the " Male " Fern and the " Lady " Fern. But 

 these are quite erroneous names, for the leafy plant is 



