'^°^sept"'^i88i  ™' }  Expeidments  on  Thymol  and  Carbolic  Acid.  461 
tate,  which  with  a  greater  addition  of  chlorinated  soda  is  dissolved^ 
but  at  the  same  time  the  thymol  precipitate  dissolves. 
4.  Chlorine  Water. 
The  chlorine  water  employed  was  the  officinal  preparation,  and  in 
the  same  proportion  and  quantity  as  in  the  third  series  of  experiments. 
a.  Experiments  with  Thymol:  The  results  obtained  were  nearly  the 
same  as  those  in  the  previous  experiments  (third  series),  only  that  here 
also  an  equal  volume  of  chlorine  water  produced  no  apparent  change. 
When  solution  of  ammonia  is  added  to  the  turbid  mixture  there  occurs, 
either  immediately  or  after  a  short  time,  according  to  the  quantity  of 
ammonia  added,  a  clear  mixture,  and  with  dilutions  of  1  to  1,000, 
bluish  green ;  1  to  2,000,  greenish,  and  with  the  remainder,  according^ 
to  the  dilution,  a  more  or  less  greenish  color. 
6.  Experiments  ivith  Carbolic  Acid:  The  same  appearances  occur 
here  as  in  those  with  chlorinated  soda. 
Chlorine  water  can  be  used  in  the  same  manner  as  chlorinated  soda 
to  distinguish  thymol  from  carbolic  acid,  but  an  excess  of  the  reagent 
must  be  avoided.  I  experimented  to  determine  whether  thymol  could 
be  detected  in  the  presence  of  carbolic  acid  with  this  result,  that  if  to 
5  cc.  of  a  solution  of  1  to  1,000  of  carbolic  acid  with  1  to  8,000  of 
thymol  (equal  parts)  5  drops  of  chlorine  water  be  added  considerable 
opalescence  occurs ;  indeed,  with  a  mixture  which  contained  1  to  10,000 
of  thymol,  chlorine  water  furnished  a  distinct  reaction. 
5.  Bromine  Water. 
This  reagent  shows  towards  thymol  the  same  behavior  as  towards 
carbolic  acid,  but  the  sensitiveness  is  greater,  as  in  a  solution  of  1  to 
60,000  a  turbidity  occurs,  whilst  with  carbolic  acid,  according  to 
Almen,  such  a  result  was  not  obtained  until  after  twenty-four  hours. 
6.  Chloride  of  Gold. 
Read  in  the  dilution  in  which  it  is  usually  employed  as  a  reagent, 
and  1  drop  was  added  to  5  cc.  of  thymol  or  carbolic  acid  solution. 
a.  Experiments  with  Thymol:  1  to  1,000:  the  mixture  in  about  one 
second  became  turbid  and  greenish-black. 
1  to  2,000 :  the  same  appearance  in  two  seconds. 
1  to  4,000 :  after  about  ten  seconds,  only  the  color  was  somewhat 
brighter. 
1  to  8,000.  ^  rpj^^  action  occurred  later  or  earlier,  dependiuir  on 
1  to  16,000:  y  '     i  ^ 
'         '      the  dilution. 
1  to  32,000 : 
