PREFACE. 



valuable papers on the subject contributed by him to the " Journal 

 of the Linnean Society " and " The Gardeners' Chronicle ; " to the 

 Director and Curator of the Royal Gardens at Kew and the staff 

 for their kindly help during frequent inspections of the extensive 

 collection of Coniferae in the Koyal Gardens ; to the Keepers of the 

 Herbariums at Kew and the Natural History Museum for the 

 facilities they afforded for examining original herbarium types under 

 their charge ; and to many correspondents for their untiring kindness 

 in supplying specimens of foliage and flowers of rare and valuable 

 species which are duly acknowledged in their respective places. 



THE AUTHOR. 

 Royal Exotic Nwsery, Chelsea. 



