PREFACE. vii 



successive discoveries ; and as the experience of 

 nearly a century corroborates these views, it is 

 probable that for years to come there will still remain 

 ample room in Africa for men inclined for adventure 

 to carry out in them, if nowhere else, the metier of 

 explorers. 



FRANCIS GALTON. 



S, St. James's Place, 



April 27th, 1858. 



The four Mimosas that, to the exclusion of nearly every other tree or bush, 

 form the vegetation of Damara-land. 



52 



