SCATTERED ROCKS, ETC.— VOLCANIC REGIONS. 



fill 



We have thus concluded the catalogue of dangers, and presumed 

 dangers, which for ao many years " disfigured our charts." As will be 

 seen by reference to the charts, the direct test of the sounding lead has 

 caused the disappearance of most of them ; and they are mainly retained 

 here as an interesting record. 



2.— VOLCANIC REGIONS. 



In the neighbourhood of the Equator, and between longitude 16° and 

 24'' W., is an area which in former years was very fertile in the produc- 

 tion of supposed rocks and banks. The nature of this area is now better 

 understood, and we have thus only the occasional announcement of 

 volcanic shocks having been felt. They are indeed very numerous, and in 

 our South Atlantic Directory, we have given a series of these occurrences. 

 They need not, therefore, be repeated here. f^ 



It is now well known that an earthquake or tremora at sea has exactly 

 the same effect on vessels as if they had rubbed over a reef of rocks, or 

 the heavy cable had suddenly run out. We have many instances of this, 



