X PREFACE. 



to state, that he will, as heretofore, be willing to aid those 

 inquirers who may find difficulty in recognizing the Ferns 

 they gather ; and that he will be glad to receive any addi- 

 tional information concerning the distribution or variation 

 of the species generally, accompanied, when practicable, by 

 illustrative specimens. 



Botanic Gardens, Chelsea, London, 

 October, 1855. 



