DISINFECTANTS  IN  ARRESTING  CATTLE  PLAGUE.  437 
at  the  same  time  in  pure  air.  No  difference  in  the  rate  or 
amount  of  oxidation  could  be  detected. 
II.  A  colorless  solution  of  subchloride  of  copper  in  ammonia 
was  prepared  and  divided  into  two  parts  ;  one  being  mixed  with 
a  little  carbolic  acid.  On  pouring  them  through  the  air  into  flat 
white  dishes,  no  difference  in  the  progress  of  the  oxidation  could 
be  detected. 
III.  A  mixture  of  pyrogallic  acid  and  solution  of  potash  was 
shaken  up  in  a  large  stoppered  bottle.  It  was  then  opened  under 
water,  and  the  amount  of  absorption  of  the  atmospheric  oxygen 
noted.  The  same  experiment  was  repeated  after  the  addition  of 
carbolic  acid  to  the  potash  solution.  The  same  quantities  were 
used  and  the  agitation  was  continued  for  the  same  time.  On 
again  opening  the  bottle  under  water  the  absorption  was  found  to 
be  the  same  as  before. 
IV.  The  last  experiment  was  repeated,  substituting  crystals  of 
sulphate  of  iron  for  pyrogallic  acid.  The  result  showed  equally 
that  the  presence  of  carbolic  acid  exerted  no  retarding  influence 
on  the  oxidation. 
Y.  Iron  filings  were  shaken  up  in  water  with  the  same  result. 
VI.  A  "philosophical  lamp"  was  made  by  arranging  a 
platinum  spiral  over  the  wick  of  a  spirit  lamp,  containing  alcohol 
mixed  with  a  little  ether ;  on  lighting,  and  then  blowing  it  out, 
the  plantinum  continued  to  glow  brightly.  Pieces  of  solid  car- 
bolic acid  were  then  carefully  placed  in  the  cup  of  the  brass  wick 
holder,  surrounding,  but  not  in  contact  with  the  wick.  The  heat 
soon  melted  the  acid  and  raised  its  vapor  round  the  platinum 
spiral,  but  without  occasioning  any  alteration  in  the  brightness 
of  its  glow. 
VII.  Lead  pyrophorus  was  poured  into  two  long  and  narrow 
jars  of  air,  one  of  which  had  its  interior  moistened  with  liquid 
carbolic  acid.  Not  the  slightest  appreciable  difference  could  be 
detected  between  the  rapidity  of  oxidation  in  the  two  jars. 
VIII.  Paper  moistened  with  sulphate  of  manganese  solution, 
and  dried,  was  dipped  into  caustic  ammonia,  both  with  and  with- 
out carbolic  acid.  No  difference  whatever  could  be  detected  in 
the  rate  of  its  darkening. 
