14 



that this is sage and wholesome advice, and the only question is, who 

 is to sustain the expense ? Not long ago, somewhere about the time 

 that Dr Brown was prosecuting his labours, it will be remembered that 

 General Wynard said that " Nature had furnished the cups if only 

 science would take the trouble to make them secure." It is but to 

 repeat an oft-told story that with a good supply of water South Africa 

 would be one of the finest of nature's gardens, and would be capable of 

 producing two crops a year, in addition to, furnishing fodder for sheep 

 and cattle. The question of the water supply for irrigation and other 

 purposes has been staved off year after year, and nothing has been done. 

 It is not too much to say, however, that the question must make itself 

 felt, as it is one of the chief factors in the ultimate prosperity of South 

 Africa. The author is evidently in love with his subject, and has con- 

 tributed a mass of facts to Hydrology which will be useful to all coun- 

 tries of an arid character.' 



XI.— Forests and Moisture ; or Effects of Forests on 

 Humidity of Climate- Price 10s. 



Iu this are given details of phenomena of vegetation on 

 which the meteorological effects of forests affecting the 

 humidity of climate depend — of the effects of forests on 

 the humidity of the.atmosphere, and on the humidity of the 

 ground, on marshes, on the moisture of a wide expanse of 

 country, on the local rainfall, and on rivers — and of the 

 correspondence between the distribution of the rainfall and 

 of forests — the measure of correspondence between the 

 distribution of the rainfall and that of forests — the distri- 

 bution of the rainfall dependent on geographical position, 

 or determined by the contour of a country — the distribution 

 of forests affected by the distribution of the rainfall — and 

 the local effects of forests on the distribution of the rain- 

 fall within the forest district. 



Extracts from Preface.—' This volume is one of a ueries. In the 

 first of the series — a volume entitled — published last year, Hydrology 

 of South Africa; or, Details of the Former Hydrographic Condition of 

 the Gape of Good Hope and of Causes of Us recent Aridity, with Sugges- 

 tions of appropriate Remedies for this Aridity. 



' This volume, on the effects of forests on the humidity of the atmos- 

 phere and the ground, follows supplying illustrations of the reasonable- 

 ness of the suggestion made in regard to the conservation and extension 

 of forests as a subordinate means of arresting and counteracting the 

 deaeccation and aridity of the country. 1 



