PREFACE TO THE SECOND EDITION. 



DURING the twelve years which have elapsed since the 

 first edition of this Flora was published, considerable 

 progress has been made towards a fuller knowledge of the 

 Botany of Harrow and its neighbourhood. Between 1864 

 and 1869, when the Flora of Middlesex was published, 

 several plants of interest were found, the Rev. Dr. Farrar 

 being one of the principal discoverers. The results of 

 these discoveries are recorded in this latter work. Its 

 Authors, Dr. Trimen and Professor W. Thiselton Dyer, 

 have largely contributed to a full and accurate knowledge 

 of the botany of the district. New plants have been added, 

 new localities noted, the researches of other botanists in- 

 vestigated and set down; a few errors in the former edition 

 of this work have been brought to light, while its general 

 correctness has been confirmed. Free use has been made 

 in this edition of the hoarded wealth of the "Flora of 

 Middlesex," and the Editor gratefully acknowledges the 

 ample return received for any assistance rendered to its 

 Authors, either by himself or by the first edition of this 

 work. 



