The  time  within  which  the  nuisance  must  be  abated  must
be  specified  on  the  notice,  and  varies  from  "  forthwith  "
in  the  case  of  choked  drains  or  the  more  urgent  and  gross
nuisances  to  fourteen  or  twenty- one  days  where  more  or
less  considerable  work  is  required.  In  the  metropolis  and
Scotland  a  specification  of  the  works  necessary  to  abate
the  nuisance  is  not  required,  but  for  the  provincial  dis-
tricts it  has  been  decided  that  "  an  order  under  section  96
of  the  Public  Health  Act,  1875,  whether  it  be  made  at  the
instance  of  the  local  authority  or  of  a  private  individual,
and  whether  it  be  for  the  abatement  of  a  nuisance  or  for
the  prohibition  of  the  recurrence  of  a  nuisance,  must
specify  the  works  necessary  to  abate  the  nuisance  or
prevent  its  recurrence  as  the  case  may  be,  if  any  works  are
necessary  for  that  purpose.  But  where  the  recurrence
of  a  nuisance  can  be  prevented  by  merely  refraining  from
doing  the  acts  which  caused  it,  and  no  works  are  necessary
to  prevent  its  recurrence,  an  order  simply  prohibiting
the  doing  of  any  acts  which  may  lead  to  a  recurrence
of  the  nuisance  is  good."  ^  This  requirement,  which,
of  course,  does  not  apply  in  the  case  of  nuisance  arising

1  Blackburn,  J.,  in  Cook  v.  Montague  (1872),  L.  R.  7  Q.  B.  418.
2  The  Queen  v,  Horrocks  and  Others,  64  J.  P.  661  ;  69  L.  J.  Q.  B.
688.
H.A,  h


146         PUBLIC   HEALTH  ADMINISTRATION.
from  the  emission  of  black  smoke  from  a  chimney  other
than  that  of  a  dweUing-house/  is  open  to  some  objection.
