BRITISH FERNS 



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 



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a 



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r &X**?i4-%+- &fro. IPs 



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 



