vi PREFACE. 
Donovan, Capt. Creaghe-Haward, Dean Isaacs, Major Leeson 
Marshall, Sir Frederick Moore, Mr. R. Lloyd Praeger, Dr. 
W. A. Shoolbred, Mr. H. Synnott and Archdeacon Wynne. 
For help in determining critical plants, I am indebted to 
Mr. Arthur Bennett, Major Wolley-Dod, Mr. Alfred Fryer, the 
Messrs. H. and J. Groves, Mr. F. J. Hanbury, the Revs. W. R. 
and E. F. Linton, the Rev. E. S. Marshall, Mr. H. W. Pugsley 
and the Rev. W. Moyle-Rogers. 
Not only my own thanks but those of all botanists are also 
due to Prof. Dixon, of Trinity College, Dublin, who, by a 
series of troublesome experiments, carried on for a period of 
ten years, has fully demonstrated the hybrid origin of the 
much discussed Sazifraga hirsuta and its allied forms. 
The writer is fully conscious of the imperfections of this flora 
and can only plead in excuse the complexity and large extent 
of the areas to be examined and the serious disadvantage of a 
residence nearly two hundred miles distant from the scene of 
his researches. This disadvantage, however, he gratefully 
acknowledges, has been largely counterbalanced by the 
hospitality and many kindnesses received from friends in 
different parts of the county. 
REGINALD W. SCULLY. 
Dundrum, Co. Dublin, 
November, 1916. 
