
 
		destruction;  for  it  would not have been  possible to extricate  either  
 from such a  place,  had  there  even  been  more  persons  at  hand  to  
 attempt  it:  the  ground  continued  to  crack  and  break  away  for 
 some  distance  farther,  as the  horse galloped  on  from the hole, and  
 a  large  aperture  was  soon formed  in  the  crusted  surface  of  the  
 marsh as the pieces fell in one  after  another.  The whole  extent of  
 the  danger  was  not  at  first  perceived  by  the  rider  who  had  so  
 narrowly  escaped;  but the person  who was following saw the chasm  
 which  had  been  made,  and  wheeling  his  horse  round  in  another  
 direction was just in time to avoid plunging into it.  As this accident  
 occurred near  the  middle  of  the  marsh,  it  was  difficult  to decide  
 upon the best  path  to be pursued,  the  surface  being everywhere in  
 appearance  the same;  but, in  order that the weight might be  more  
 equally divided,  both riders dismounted, and continued to lead  their  
 horses till they reached a  firmer place.  This  was however  no  easy  
 matter;  as the poor animals  were  so  terrified  with  their  repeated  
 stumbles,  that they could  with  difficulty be pulled  along,  and they  
 trembled so violently as to be almost incapable of keeping their legs,  
 for the surface frequently  cracked  and  partially gave  way in  places  
 which appeared to be secure,  and  the  parties were so often  obliged  
 to alter their  direction, that they almost despaired  of being  able to  
 bring  off their  horses.  After much winding and  turning,  this  was,  
 however, at length effected, and both horses and riders were heartily  
 glad to  find  themselves  once  more on firm  ground.  Nothing  was  
 said  to our guides of this accident, but it served to convince us  that  
 their apprehensions of the marsh were not  groundless, and we  afterwards  
 took the precaution  of dismounting when we had occasion to  
 cross any,part which was considered to be dangerous.-  We found on  
 examination  that  many  hollow  spaces  of  considerable  depth  and  
 extent existed in various parts of  the  marsh ;  and  that the  crust of  
 salt and mud which covered them  was sometimes no more  than  two  
 inches, and an  inch and a half, in  thickness. 
 These  usually occurred  in  the  most level  parts, but  as  the crust  
 was everywhere  in  appearance the  same,  there  were  no  means  of  
 ascertaining where they  existed, but by breaking  the  surface  which  
 concealed them.  ... 
 The water contained in these hollows  was  invariably salt, or  very  
 brackish;  it  was  usually  clear,  and  was  in  some  places  deep:  the  
 depth of mud below the water  must also have been  sometimes  considerable, 
  and the  vacant space contained  between the outer surface  
 of the marsh and  the  water  was in various  instances observed to be  
 as  much as twelve  and fifteen  feet in  depth.  We had no means of  
 ascertaining the depth of  the water in the hollow, alluded  to  above;  
 but  the space  between its surface  and  that of  the  marsh  appeared  
 to be  more  than  twelve  feet, and,  from  the  sound  occasioned  by  
 the fall of  the pieces into it,  its depth could scarcely have been  less  
 than  six or eight  feet.  In  that part of  the marsh which surrounds  
 the Gusser el Jebha  the nature .of .these  pits  is  very apparent;  for  
 the  ground  being  unequal,  and  overgrown  with  reeds  and brushwood, 
  no crust has  been formed over them, and their dimensions are  
 therefore  easily  ascertained.  They are  here  very  numerous, and it  
 would be scarcely possible to escape  falling into  them after  dark, as