Before  quitting  the  subject,  perhaps  mention  ought  to  be  made  that  a
blistered  print  which  is  eventually  to  be  treated  in  the  way  described,  should  be
handled  with  even  greater  care  throughout  the  operations  of  washing  and
mounting  it  than  would  be  absolutely  necessary  for  one  otherwise.  The  very
simple  reason  for  this  being  that  a  broken  blister  will  not  mend  in  the  way  de-
scribed so  neatly  as  one  which  is  purposely  cut  with  a  sharp  knife.  Blisters
can  be  increased  considerably  in  size,  besides  being  fairly  easily  broken,  by  in-
judicious handling  in  the  process  of  mounting.
