To  a  declaration  on  a  deed  conveying  an  exclusive  license  to  use  a  patent,  a
plea  that  the  invention  was  worthless,  and  that  at  the  time  of  the  making  of  the
deed  the  plaintiff  knew  it  and  the  defendant  did  not,  is  bad.  Smith  v.  Scott,
xcv.  771 ;  6  C.  B.  N.  S.  771.
(a)  Immaterial  issue.
To  a  declaration  charging  that  A.  drew  a  hill  to  his  own  order,  endorsed  it  to
defendant,  who  endorsed  it  to  plaintiff,  and  that  bill  dishonored,  plea  denying
endorsement  to  defendant  is  bad.  Macgregor  v.  Rhodes,  lxxxviii.  266 ;  6  E.  &  B.
266.
Plea  to  an  averment  of  damages  is  bad.  Reindel  v.  Schell,  xciii.  97 ;  4  C.  B.
N.  S.  97.
A  plea  to  an  action  against  a  carrier  for  negligent  and  careless  stowage,  that
the  goods  were  stowed  as  they  were  by  direction  and  license  of  plaintiff,  is  bad.
Hutchinson  v.  Guion,  xciv.  149 ;  5  C.  B.  N.  S.  149.
(6)  Traverse  must  not  be  too  broad.
To  a  count  for  carelessly  working  mines,  a  plea  that  the  lord  of  the  manor
was  seized  in  fee  of  the  mines  in  the  manor  and  for  forty  years  had  been  used
to  work  them  without  leaving  support  and  justifying  as  tenant  to  the  lord,  bad
as  not  showing  acts  done  on  the  plaintiff's  lands.  Blackett  v.  Bradley,  ci.  940;
1  B.  &  S.  940.
(c)  Traverse  must  not  be  too  narrow.
Plea  that  it  was  agreed  that  a  certain  sum  was  the  balance  due  on  annual
accountings  and  that  this  sum  was  paid,  is  insufficient.  Perry  v.  Attwood,
lxxxviii.  691  ;  6  E.  &  B.  691.
Two  insufficient  pleas  cannot  be  used  to  help  each  other.  Day  v.  Hemings,
ci.  993  ;  1  B.  &  S.  993.
