164 



DEFICIENCY OF IIISTOEICAL EECORDS. 



[Ch. XXX. 



of the ocean. The signs of these events have, probably, been 

 rendered visible by subsequent mutations, as by the en- 

 croachments of the sea upon the coast, by deep excavations 

 made by torrents and rivers, by the opening of new ravines, 

 and chasms, and other effects of natural agents, so active in 

 districts agitated by subterranean movements. 



If it be asked why, if such wonderful monuments exist, so 

 few have hitherto been brought to light, we reply — ^because 

 they have not been searched for. In order to rescue from 



memorials of former 



must know what he m 



circumstance 



He must 



quainted with the action and effect of physical causes, in 

 order to recognise, explain, and describe correctly the phe- 

 nomena when they present themselves. 



The best known of the great volcanic regions, of which the 



XXII 



Northern 



must 



map 



somethin 



the district round Napl 



and even here it is to recent 



antiquarian and geological research, not to history, that we 

 are principally indebted for the information. I shall now 

 proceed to lay before the reader some of the results of modern 

 investigations in the Bay of Baise and the adjoining coast. 



PEOOFS OF ELEVATION Al^D SUBSIDElNrCE IN THE BAY OF BAI^. 



>/ 



monument 



antiquity, a representation of which is given in the frontis- 

 piece * of this work (Vol, I.), affords in itself alone unequi- 

 vocal evidence that the relative level of land and sea has 

 changed twice at Puzzuoli since the Christian era ; and each 



* The view of the temple given in trate a paper by Mr. Babbage on the 



the frontispiece has been reduced from temple of Serapis, read March, 1834, 



part of a beautiful coloured drawing and published in the Quart. Journ. 



taken in 1836, with the aid of the ca- of the Gcol. Soc. of London, vol. iii. 

 mera lucida, by Mr. I'Anson, to illus- 



1847. 







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