ON TMfi DRVELOPW'INT 0? THE 



LEAF AND SPOROCAPP 

 IN MARSILIA OUi\DRIFOLIA,L. 



DiG^pertation presented to the Board of 

 Ilnivercit-^^ Studies of the Jolms Hopidns Univ - 

 ersit" for th.c- der^i-ree of Doctor of R.ilosopiiy , 



"by 



Dimcar- S. Joimson. 



Baltincre, Md. 

 Ikvj 1, 1897. 



