original method of stopping rats burrowing into cob walls is to imbed broken glass into the first foot or so of cob -------------- next part -------------- <HTML><FONT FACE=arial,helvetica><FONT SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">original method of stopping rats burrowing into cob walls is to imbed broken glass into the first foot or so of cob </FONT></HTML>