ACKNOWLEDGMENTS 
xi 
J. McClounie, Donald Malloch, and the late E. G. Alston, of the British Central Africa 
Administration ; while I have also to acknowledge the loan of photographs from Messrs. 
E. Harrhy, the late Gilbert Stevenson, Commander Percy Cullen, and many others. 
A special mention should be made of the valuable Appendix to my chapter on 
“ The Botany of British Central Africa ”—the list of all the known species of plants 
collected there from 1859 to the present day. This list has been prepared for 
inclusion in my book, under the direction of Mr. Thiselton Dyer, by Mr. I H. 
Burkill, b.a., a member of the Scientific Staff at Kew. 
It will be seen from this long list of persons to whom I am indebted for information 
that my book represents the summing-up of others’ researches as well as of my own, and 
that if praise be awarded to the book, as to the seven years’ work of which it is the 
record, that praise must be fairly distributed among many workers. It is pleasant to 
me to think that one of my collaborators in this work is a native of British Central 
Africa. 
H. H. JOHNSTON. 
