OONTEKTS. Si 



SectiOiST I. — On the Measure of Correspondence between the 



Distribution of the Rainfall and that of Forests, - 256 



This is illustrated from statements by Dr Brandis in regard to India 

 (p. 256), by Mr Maclaren in regard to America (p. 259), by a com- 

 parison of report on the rainfall in North America, issued by the 

 Smithsonian Institution (p. 262), with the account of the forests 

 of North America given by M. Marny (p. 261); and a statement 

 in regard to the destruction of forests in South Africa (p. 269). 



Section II. — On the Distribution of the Rainfall dependent on 

 Geographical Position, being determined by the Contour of 

 a Country, - - - - - - 271 



An illustration of the distribution of the rainfall being affected by the 

 altitude of a country is given in the effects of a wind- wave which 

 passed over Europe in September 1866 (p. 272) ; with an illustra- 

 tion of the same operation in the production of a " mackerel sky" ; 

 and of the Table Cloth on Table Mountain (p. 273). Which are 

 followed by an exposition by Cezanne of his doctrine that it is 

 determined in a great measure by the rapidity wit;h which the 

 atmospheric current rises (p. 271) ; and illustrations of this being 

 the Case supplied by Kaulin (p. 280). 



Section III. — On the Distribution of Forests Affected by the 



Distribution of the Rainfall, - . - . 283 



There is cited a statement by Marsh relative to a tendercy manifested 

 by ligneous vegetables to secure the universal occupancy of land 

 (p. 283). The operation of laws regulating the dispersion of 

 vegetables is illustrated (p. 286) ; and the operation of those on the 

 dispersion of trees is seen to depend in part upon the rainfall 

 (p. 289). 



Section IV. — On the Local Effects of Forests on the Distribu- 

 tion of the Rainfall ivithin the Forest District, - - 293 

 The general effect of forests is shown to be to retard the flow of the 

 rain-water precipitated (293), and so in prehistoric times to have 

 converted torrents into peaceful streams (29i), while the same effect 

 is shown to be produced by them still (p. 295). There are cited 

 observations adduced to prove that appaiently they influence some- 

 what the quantity of the rainfall and the local distribut'on of it over 

 the year (p. 299) ; and the reconciliation of conflicting observations 

 and opinions (p. 302) is shown to be possible (p. 303). 



Conclusion, ...--. 307 



