20  Preparation  of  Dichloramin  T.  {A^^Ptagu 
Further  Products  of  Chlorination. 
By  the  further  chlorination  of  the  1.2  oil  products  may  be  ob- 
tained having  a  specific  gravity  of  1.5  and  higher.  This  may  be 
carried  out  by  chlorinating  directly  at  ioo°  C.  or  with  a  solvent 
such  as  chloroform  at  its  boiling  point.  The  oil  of  specific  gravity 
1.4  is  amber  colored  and  of  the  consistency  of  molasses.  The 
dichloramin  is  still  soluble,  although  to  a  less  extent.  The  future 
may  find  a  use  for  this  type  of  oil,  since  the  increased  viscosity  pre- 
sents an  advantage  in  certain  cases. 
Dichloramin  T.  prepared  as  given  above  is  freehy  soluble  in 
chlorinated  eucalyptol  1.2. 
The  solutions  should  be  prepared  about  as  follows : 
Preparation  of  7V2  Per  Cent.  Solution. 
Measure  oft  150  Cc.  of  oil  into  a  dry  brown  bottle,  preferably 
one  with  a  glass  stopper.  Add  to  this  11.5  grams  powdered  dichlora- 
min T.  This  will  dissolve,  if  shaken  occasionally,  in  about  an  hour. 
It  should  not  be  warmed.  This  makes  a  jYi  per  cent,  solution,  and 
is  used  for  all  dressings  subsequent  to  the  first  two  or  three.  This 
solution  should  keep  for  two  weeks  at  least.  If  this  is  used  in  an 
atomizer,  as  directed,  it  has  been  found  that  one  filling  of  the  usual 
atomizer  reservoir  will  dress  from  100  to  150  cases. 
Preparation  of  20  Per  Cent.  Solution. 
This  solution  should  be  made  up  about  25  Cc.  at  a  time,  using 
5  Gm.  of  dichloramin  T.  to  25  Cc.  of  oil.  It  is  most  quickly  accom- 
plished by  trituration  and  should  be  kept  in  a  brown  bottle.  This 
is  applied  to  fresh  wounds  and  for  the  first  treatment  of  infected 
wounds  and  focal  infections.  It  is  most  conveniently  applied  with 
an  ordinary  medicine  dropper.  This  solution  is  good  until  a  crop 
of  fine  crystals  appears  in  it,  which  may  happen  in  three  days, 
although  it  may  last  for  ten  days  or  more. 
When  using  the  solution  in  an  atomizer,  the  reservoir  of  which 
is  of  white  glass,  it  should  be  kept  in  the  dark  whenever  possible 
and  never  exposed  to  sunlight.  Light  greatly  accelerates  the  de- 
composition of  dichloramin  T.  in  solution.  The  following  points 
should  receive  consideration  in  its  clinical  use. 
I.  Surgical  asepsis,  as  perfect  as  possible,  should  be  used  at  both 
the  primary  operation  and  subsequent  dressings. 
