vill AUTHOR’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. 
CAMBRIDGE, 
March 18th, 1894. 
