PREFACE. 



As already explained, the large and constantly increasing mass of 

 material having exceeded the space allotted to it, made it necessary to 

 divide Volume IV of the "Flora of Tropical Africa" into two sections, 

 which, however, are themselves of equivalent bulk to volumes and 

 might have been numbered as such had not the plan on which it has 

 been found advisable to prepare the work made this impracticable. 



For the amended definition of the regions into which the area of 

 the flora is divided, reference may be made to the preface to the 

 seventh volume. 



In the prefaces to the first, the preceding section of this and 

 succeeding volumes, will be found an enumeration of the materials 

 employed up to 18G8, and of the most important additions to them 

 which have reached Kew since. 



The further collections cited in the present volume are : 



I. Upper Guinea.— Sir H. H. Johnston, G.C.M.G., K.C.B., and 

 H. Reynolds, Liberia ; E. W. Foster and N. L. Phillips, Lagos ; W. R. 

 Elliott, Northern Nigeria; Capt. G. B. Gosling, Norman C. McLeod 

 and H. N. Thompson, Southern Nigeria. 



III. Nile Land. — Lieut.-Col. A. F. Appleton, Dr. R. E. Drake- 

 Brockman and Major D. Thomson, Somaliland ; H. Brown, Bahr-el- 

 Ghazal ; Dr. A. G. Bagshawe, E. Brown and M. T. Dawe, Uganda ; 

 Sir Evan James, K.O.I.E., C.S.I., Uganda and British East Africa; 

 C. F. Elliott, A. P. Grenfell, Claude Hollis and Andrew Linton, 

 British East Africa. 



IV. Lower Guinea. — Prof. II. H. W. Pearson, Damaraland. 



V. South Central. — H. N. Ridley, plants collected by Major F. 

 Chaves in the Congo State. 



VI. Mozambique. — J. F. Cunningham and Miss E. Kenyon, 



