AITTHOE S PREFACE. 



In certain parts of the work I have received valuable 

 assistance from Mr. C. Davies Sherborn. Mr. Rufford, 

 whose labours have been the primary cause of this 

 Catalogue, has aided me from time to time by helpful 

 suggestions, and by his accurate local knowledge of the 

 Wealden flora in the neighbourhood of Hastings. 



In conclusion I wish to express my thanks for com- 

 munications received from the Marquis of Saporta, Prof. 

 Stenzel of Breslau, Prof. Zeiller of Paris, and Dr. Bommer 

 of Brussels. 



A. C. SEWARD. 



Cambkidoe, 

 March \Zth, 1894. 



