
    Ham vs. Parkerson et al.
    
    While a written contract cannot be altered by parol, yet if its execution was the result of fraud, accident or mistake, such fact may be pleaded and proved by parol in avoidance thereof.
    
      (al) The evidence in this case showed that a defendant in fi.fa., who was about to obtain an exemption in certain property levied on, desired to give the constable making the levy a forthcoming bond . for the property, which the latter agreed to accept; a scrivener present volunteered to draw the bond, and did so, but made it a bond conditioned to pay the fi.fa. Neither the defendant nor the officer read the bond before it was signed, or knew of its contents :
    
      .Held, that, to a suit on the bond such facts might be pleaded and proved by parol, and would constitute a good defence. 54 Ga., 289; 52 Ib., 149; 56 Ib., 31, 32; 59 Ib., 850.
    -Crawford, Justice.
     