The  supreme  court  has  said  that  the  law  does  not  permit  enlarge-
ments of  an  original  specification  any  more  than  it  does  where  let-
ters patent  already  granted  are  re-issued ;  and  it  regards  with
jealousy  and  disfavor  any  attempt  to  enlarge  the  scope  of  an  appli-
cation once  filed,  or  of  letters  patent  once  granted,  the  effect  of
which  would  be  to  enable  the  patentee  to  appropriate  other  inven-
tions made  prior  to  such  alteration,  or  improvements  wl.ich  have
gone  into  public  use.     Railway  Co.  v.  Sayles,  97  U.  S.  554.
Nevertheless  the  rules  of  the  patent-office  permit  amendments  to
a  limited  extent,  as  follows  :  The  applicant  has  a  right  to  amend
before  or  after  the  first  rejection  ;  and  he  may  amend  as  often  as
the  examiner  presents  any  new  references  or  reasons  for  rejection.
