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By prof. C. LLOYD MORGAN. 

 Read March Qth, 1887. 



SITUATED as we arc in Bristol on the folded Palteo- 

 zoics, within sight of the Mendip antiolinal, and 

 almost within sight of the denuded base of what was onco 

 a considerable mountain system in Wales, wo cannot fail 

 to be specially interested in any theory which endeavours to 

 elucidate the process of mountain building and strata fold- 

 ing. Having moreover at our very doors the Clifton fault, 

 within easy distance the Clapton-in-Gordano fault, and in 

 our coal basins faults without number, we are led to take all 

 the more interest in such a theory as attempts delinitcly to 

 connect normal and reversed faulting with other great earth 

 movements. I have thorefoi'e thought it well to bring 

 before the members of the Geological Section of the Bristol 

 Naturalists' Society some account of a hypothesis recently 

 advocated by Mr. Mellard B,eade, C.K., P.G.S., etc., in a 

 volume bearing the same title as this paper, and to add 

 thei'eto some few criticisms, together with some general 

 remarks on this interesting but most difficult subject. 



The hypothesis that has until recently found most favour 



