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HUTTONIAN THEORY. 



225 



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given by Dr Hatton, in his Theory 



the 



Earth, vol. i., from a drawing made by Sir James 

 Hall. The nature of the curve fuperficies into 

 which the fchiflus is bent, is the better under- 

 ftood from this, that, befides tranfverfe fedions 



from north to fouth, the deep indentures which 

 the fea has made, and the projecting points of 

 rock, exhibit many longitudinal fedions,, in a 

 diredion from eall to well:. 



w 



202. The dock-yards at Plymouth are in fe- 

 veral places cut out of a folid rock of primary 

 fchiflus, Angularly incurvated. The inflexions 

 are feen there to great advantage, being exhibi- 

 ted in three fedions, at right angles to one ano- 

 ther, tranfverfe^ longitudinal and horizontal. 



203. From thefe inftances, to which it were 



add many more, two concluii 



be dra 



y 



Th 



firft 



f thefe is very ob 



that the ft 



muft h 



b 



foft 



and 



hen they acquired their prefent form 



The bending of an indurated bed of ftone 

 an arch of great curvature,^and without frad 



the preceding exam 



phyfical im 



poilibility. SaulTure has indeed obferved a frac- 



r 



ture CO accompany the bending, in one or two 

 cafes ; but it is an uncommon phenomenon. 



here it happens, muft no doubt be und 



ftood to indicate an imperfed flexibility. 



# it be granted that the ft rata were at any 



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