PREFACE 
IX 
as the hybrids ; but others will have none of this, and they 
smile pityingly at what they term misguided enthusiasm. 
There are over 300 known species, whilst explorations in 
China, and elsewhere, are still adding to the number. The 
number of hybrids already exceeds the number of species, 
so there is ample choice for us all. 
FRED. W. MOORE. 
Royal Botanic Gardens, 
Glasnkvin. 
