Acknowledgments 



In the course of most extensive studies many hands contribute to 

 the end result, but in few have so many kind and able collaborators 

 assisted as in this one. My personal field work in southern and 

 eastern Africa was supported, first, in 1924-25, by the National Re- 

 search Council with funds supplied by the Rockefeller Foundation, 

 and later, in 1950-51, by grants from the John Simon Guggenheim 

 Memorial Foundation, the American Philosophical Society, and the 

 Smithsonian Institution, Without these sponsoring organizations 

 the work would not have been possible, and in acknowledging their 

 basic aid I can only hope that the results here brought together may 

 justify their confidence and their support. 



During the work in Africa practically everyone approached was co- 

 operative and helpful, and the number of individuals who contributed 

 information, advice, or direct assistance in the actual field work is 

 too large to list here. However, the following deserve special grateful 

 mention: E. H. Ashton, R. I. G. Attwell, K. de P. Beaton, C. F. 

 Belcher, C. W. Benson, H. A. W. Bladen, G. J. Broekhuysen, W. 

 Buttiker, E. L. Button, W. L. Chiazzari, T. M. Crooks, W. K. Cul- 

 bert, E. Davison, E. H. Edwards, R. Guy, H. H. Hamling, E. L. 

 Haydock, J. Hewitt, R. A. F. Hurt, C. H. Jerome, H. M. Miles, B. V. 

 Neuby-Varty, M. E. W. North, G. H. Patten, C. R. S. Pitman, 

 D. C. H. Plowes, H. B. Potter, C. D. Priest, V. L. Pringle, G. A. 

 Ranger, the late A. Roberts, Miss C. Robinson, P. Rougeot, J. Sabater, 

 C. J. Skead, R. E. Symons, J. S. Taylor, R. C. Tredgold, F. G. Tur- 

 berville, V. G. L. van Someren, A. W. Vincent, J. Vincent, C. M. N. 

 White, C. Whybrow, and J. G. Williams. Some of these individuals 

 I did not have the opportunity to meet, but they aided me by sending 

 painstaking descriptions of observations they had made, others 

 told me at length of such matters, and still others helped with actual 

 facilities for work in the field, or put me in their debt for hospitality 

 graciously extended. 



Gordon A. Ranger and C. J. Skead deserve particular mention, as 

 their contributions to the work were of unusual magnitude and qual- 

 ity. Ranger introduced me to the scaly-throated honey-guide near 

 Kei Road, and all my observations on this species were made in his 

 company and with the benefit of his experience and efforts. He and 

 Skead gave nearly two weeks of their time in camp with me, and the 

 information gathered there on three species of honey-guides {Indicator 

 indicator, I. minor, and /. variegatus) was so important and copious 



IV 



