
BRITISH FERNS 
то 
this ocean beating upon more permanent shores, admitting of 
life in the air; and again, in imagination, we may see some of the 
sea-weeds adapting themselves to existence, first of all within the 





Fig. 2. —Details of development of Prothallus from spore. 
area between high and low tides, or within reach of the spray, 
and eventually fringing the shores with vegetation, independent 
of the water save that afforded by the rain-giving clouds. This 

