11 PREFACE. 
Lindl.) that it was considered advisable to have plates of each side by side in 
this volume for the sake of comparison. It should also be mentioned that plate 
No. 223 of the Sikkim Orchids does not represent Calanthe tricarinata of 
Lindley (see plate No. 109 of this volume), and that plate No. 406 of the 
Sikkim Orchids represents Habenaria ensifolia Lindl., a species quite distinct from 
H. pectinata Don (see plate No. 180 of this volume). 
In conclusion I wish briefly but cordially to express my thanks to all those 
who have kindly assisted me during the preparation of this work. I am especially 
glad to avail myself of this opportunity of saying how very much I am indebted 
to my friend, Mr. Philip Mackinnon, F. L. S., whom I have known in India for 
many years as an enthusiastic botanist. To turn attention more particularly to the 
practical results of the interest he has taken in the subject of this memoir, I may 
mention that no less than nine undescribed species were discovered by him and his 
native collectors in the neighbourhood of Mussoorie, also several other rare and 
interesting species, which had not previously been recorded as Western Himalayan. 
I am very much obliged to all those who have kindly aided me with orchid 
specimens from various parts of the Western Himalaya, and trust that I may not 
have failed to mention them by name throughout the pages of this book. From 
Sir Joseph D. Hooker, who has always taken a great interest in my botanical work 
in India, Г have received very great help and encouragement. To Sir William Т, 
Thiselton-Dyer I am much indebted for having kindly allowed me, when in India, 
to consult Mr. В. A. Rolfe, the well-known orchid specialist at Kew, concerning 
some of the more critical species. I wish also to acknowledge the great assistance 
I have received from Mr. Rolfe since my return to England, as well as from 
Mr. W. Botting Hemsley, the Keeper of the Royal Herbarium. Lastly, I desire to 
thank my friend, Major D. Prain, for his willing and valuable help on many occa- 
sions, and for the trouble he has taken in supervising the preparation of the litho- 
graphs and the printing of the letterpress. 
HERBARIUM, Royan Boranic 
GARDENS, Kav; J. F. DUTHIE. 
104% February 1904. 
