11 



of riboisement and the regeneration of the mountains ia one of the moat in- 

 tereating which man haa to aolve, but it requlrea time and money, and 

 with the anthoritiea and political assemblies, technical knowledge which 

 is aa yet but very sparingly poaaessed. It is by booka so subatantial as 

 yours, sir, that public opinion can be prepared to face the importance 

 of this great work' 



IX.— Hydrology of South Africa; or Details of the 

 Former Hydrogrraphio Condition of Cape of Good 

 Hope, and of Causes of its Present Aridity, with 

 Suggestions of Appropriate Remedies for this 

 Aridity. Price lOs. 



Ia this the desiccation of South Africa, from pre-Adamic 

 times to the preseat day, is traced by iadications supplied 

 by geological formations, by the physical geography or the 

 general contour of the country, and by arborescent pro- 

 ductions in the interior, with results confirmatory of the 

 opinion that the appropriate remedies are irrigation, 

 arboriculture, and an. improved forest economy: or the 

 erection of dams to prevent the escape of a portion of 

 the rainfall to the sea — the abandonment or restriction of 

 the burning of the herbage and bush in connection with 

 pastoral and agricultural operations —the conservation and 

 extension of existing forests — and the adoption of measures 

 similar to the reboisement and gazonnement carried out in 

 France, with a view, to prevent the formation of torrents, 

 and the destruction of property occasioned by them. 



M. Jules Clav^, of world-wide reputation as a student 

 of Forest Science, wrote in the Revue des Deux Mondes of 

 1 St May 1882:— 



[Translated.'\ ' Since the first travela of Livingstone, the African 

 continent, hitherto inacesaible, has been attacked on all points at once. 

 By the north, and by the south, by the east, and by the west, hardy 

 explorers have penetrated it, traversed it, and have dragged from it 

 some of its secrets. Travellers have paid tribute and done their work 

 in opening up a path ; it ia now for science and civilisation to do theirs," 

 in studying the problema which present themselves for investigation ; ■ 

 and in drawing in the current of general circulations the peoples and 

 lands, which appear as if destined to stand outside ; and in causing to 



