organizable,  or  perfectly  free  from  the  greenish  colour  and  disinte-
grating globularity  of  pus,  or  even  from  the  lifeless  curdy  particles
of  tubercles  ;  nor  that  tuberculous  matter  shall  not  often  contain
flakes  or  films  of  imperfect  lymph.  The  diffused  tuberculation  or
infiltration  of  the  lung  from  inflammation,  that  we  have  just  been
speaking  of,  generally  presents  a  matter  in  this  transition  state.  It
is  neither  good  organisable  lymph,  nor  is  it  wholly  unorganised
tubercle  ;  and  the  albuminous  effusions  on  serous  and  mucous  surfaces
not  unfrequently  present  such  an  intermediate  state,  that  it  is  difficult
to  determine  to  which  class  they  most  belong.  I  have  again  strongly
to  repeat  what  I  long  since  told  you  with  regard  to  the  inflammatory
secretions  of  mucous  and  serous  membranes — that  lymph,  pus,  and
tubercle,  pass  by  imperceptible  gradations  into  each  other.  The
history  of  the  intermediate  products  has  yet  to  be  more  fully  studied;
and  it  is  a  subject  of  immense  importance,  for  they  probably  consti-
tute those  forms  of  phthisical  lesions  which  it  is  most  within  the
power  of  medicine  to  control.
