14 



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

 i'j 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 seoare." 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 tsvo 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 facta to Hydrology which will be useful to all couti- 

 tries of an arid character.' ^ 



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

 Humidity of Climate. Price 10s. 



In. this are given details of phenomena of vegetation on 

 which the meteorological effects of forests affecting the 

 humidity of climate depend — of the eflfects 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. 



ExTRiOTS rROM PREFACE.—' This volume is one of a ceries. In the 

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

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

 the Gape oj Oood Hope and of Causes of its recent Arulity, with Sugges- 

 tions of appropriate Remedies for this Aridity, 



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

 phere and the ground, follows aupplying illustrationa of the reasonable- 

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

 of forests as a aubordinate means of arresting and counteracting the 

 deseooation and aridity of the country.' 



