ii 
PREFACE 
Garden, Kew, for kindly allowing me the use of the collections and 
libraries. I was fortunate in finding in both establishments a staff ever 
ready to help me in my work. 
To Mr. W. S. Millard, F.Z.S., I am much obliged for having 
placed at my’disposal the collections of the Bombay Natural History 
Society. 
Special thanks are due to Lieutenant-Colonel S. E. PraM, I.M.S., whose 
assistance in procuring information on many points of botany and 
meteorology has been of the greatest value. I wish to thank him especially 
for supplying the illustrations. 
I owe a grateful tribute to Colonel F. W. Yerbury, R. A., for numerous 
notes and hints on the flora and fauna of Aden. 
Finally, I wish to acknowledge the kind services rendered by 
Major A. T. Gage, I.M.S., Director of the Botanical Survey of India, 
Mr. E. G. Baker, F.L.S., Mr. J. Hutchinson, Mr. N. E. Brown, 
A.L.S., Mr. Spencer Le Marchant Moore, B.Se,, Professor 
Dr. E. Strasburger, the Rev. M. Gohier, S.J., Professor. Dr, H. Fitting, 
Dr. Marie Hein, and Dr. C» von MarchesettL 
