in  length,  is  formed  by  the  Rhine.  Its  removal,  however,  has  been
rendered  necessary  by  the  plans  for  the  extension  of  the  town.
Near  the  Bayenthurm  (PL  A,  6),  a  square  pinnacled  tower  of
the  13  th -14th  cent.,  at  the  upper  end  of  the  town,  is  theSicherhcits-
hafen  ('safety-harbour',  where  vessels  take  refuge  in  winter  from
the  dangers  of  the  floating  ice),  which  was  formed  in  1848  by  con-
necting the  Rheinau,  then  an  island,  with  the  mainland.  Part  of
the  Rheinau  is  now  laid  out  as  a  promenade.  At  the  S.  end  of  the
harbour  is  a  spinning  factory.  The  warehouses  of  the  Freihafen
(PI.  E,  5),  or  free-harbour  for  goods  in  bond,  immediately  below
the  bridge-of-boats,  were  erected  in  1838  in  the  style  of  the  Giir-
zenich.  The  traveller  intending  to  cross  the  Iron  Bridge  (p.  31)
approaches  it  by  the  Domthor  to  the  N.
Passing  the  Trankgassenthor ,  to  the  N.  of  the  bridge ,  and  St.
Cnnibert  (see  above),  where  there  is  a  pier  of  the  steamboats  noticed
on  p.  23,  we  reach  the  N.  end  of  the  town  ('Am  Thurmchen' ;  comp.
