CATALOGUE OF BRITISH PLANT-GALLS 129 
The majority of our plants have well-established popular 
names; these I have given, and included in the general 
index. 
The number which follows the scientific names of the 
plants indicates the number of counties in which the species 
have been reported to occur, and is taken from the tenth 
edition of the London Catalogue. 
It cannot be expected that a catalogue of this magnitude 
will be free from errors. The literature of the subject 
being so widely scattered (see Bibliography), it is highly 
probable that many records have been overlooked. I claim 
the indulgence of my readers on this score, and invite their 
kind assistance towards the preparation of a second edition 
by means of letters of criticism, and by sending galls of 
which mention has been omitted. 
9 
