CAUSAL GEOLOGY. 



E. H. L. SCHWARZ, A.R.C.S.. F.G.S., 



Professor of Geology at the Rhodes University College, and 

 Late Geologist to the Cape Geological Commission. 



Messrs. BLACKIE 6 SON, Ltd., London and Glasgow. 



Sir Thomas Holland, in the Wilde Lecture on the " Recent 

 Additions to Ideas regarding the Internal Structure of the 

 Earth," stated that " until this year all agreed in assuming the 

 earth's interior to be hot, but Prof. Schwarz now prefers to think 

 it cold. So long as radio-active bodies were unknown the 

 apparent reserves of heat-energy offered the world a short life ; 

 but its actuarial value has now been increased almost indefinitely 

 by the discovery of radium in embarrassingly large quantities." 



The re-adjustments of our outlook with regard to 

 the earth in the making, its present form and 

 its future, necessitated by the recent advances in 

 Science, are dealt with in full in Causal Geology, 

 the only book which treats the subject in a form 

 readable by everyone and yet accurate in details. 



" Presenting as it does a new teaching in so attractive and 

 forcible a way, and based, moreover, on observations made in 

 South Africa, Causal Geology should meet with a specially 

 welcome reception. It has the merit, also, of avoiding dullness 

 from beginning to end, and is the kind of book that even the 

 moderately enthusiastic student of science would be unwilling to 

 lay down for long before getting to the end of it." — Mining Journal, 

 Johannesburg, April 16, 1910. 



AGENTS : 



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Juta 6 Co. 



Johannesburg = = = James Dal! <5 Co. 



CrahamstoWn = = = Juta 6 Co. 



Grocott «S Sherry. 



Vietermaritzburg = = P. Davis <S Sons. 



