460  Experiments  on  Thymol  and  Carbolic  Acid.  {^^se^Y'usi"^' 
a.  Exjmnments  with  Thymol:  1  to  1,000  :  turbid  and  opaque,  flocks 
formed  on  boiling  ;  after  some  time  (half  an  hour)  the  mixture  became 
gradually  of  a  greenish  color. 
1  to  2,000 :  same  as  last,  no  green  color. 
1  to  4,000  :  slightly  opaque,  and  on  boiling  turbid,  but  showing  no 
color. 
1  to  8,000  :  ^ 
1  to  16,000 :  V  clear  on  mixing,  but  turbid  on  boiling. 
1  to  32,000 :  j 
b.  Experiments  with  Carbolic  Acid :  Here  I  could  not  with  a  greater 
dilution  than  1  to  4,000  perceive  a  color  which  was  greenish.  Accord- 
ing to  Almen  a  fine  reaction  is  obtained  wdth  a  dilution  of  1  to  5,000. 
This  series  of  experiments  shows  that  thymol  with  chloride  of  lime 
and  ammonia  shows  no  color,  like  that  of  carbolic  acid,  but  that  thy- 
mol solutions  are  precipitated  by  chloride  of  lime.  In  continuation  of 
the  subject  I  have  made  some  experiments  with  chlorinated  soda, 
chlorine  water,  etc. 
3.  Chlorinated  Soda. 
The  solution  was  obtained  by  mixing  1  part  of  chloride  of  lime,  20 
parts  of  water  and  1  part  of  carbonate  of  soda.  Five  drops  of  this 
solution  were  added  to  5  cc.  of  the  solution  under  examination. 
a.  Experiments  with  Thymol:  1  to  1,000:  turbid  and  opaque;  on 
the  addition  of  more  of  the  solution  of  chlorinated  soda,  up  to  an 
equal  volume,  no  change  was  perceived. 
1  to  2,000  :  as  the  former  experiment. 
1  to  4,000  and  1  to  8,000  :  turbid,  opalescent,  but  no  change  on  the 
addition  of  more  of  the  reagent. 
1  to  16,000  and  1  to  32,000 :  opalescent,  and  the  mixture  grad- 
ually becomes  clear  on  the  addition  of  an  equal  volume  of  the  reagent. 
b.  Experiments  loith  Carbolic  Acid:  On  the  addition  of  chlorinated 
soda  there  arises  a  turbidity  which,  on  shaking,  immediately  disap- 
pears, and  the  mixture  becomes  more  or  less  yellow,  depending  on  the 
degree  of  concentration.  On  the  gradual  addition  of  more  chlorinated 
soda  there  occurs  a  point  when  the  turbidity  not  only  does  not  disap- 
pear, but  even  increases  with  each  further  addition,  till  at  last  a 
point  is  reached  when  it  disappears. 
The  above  quoted  experiments  show  that  chlorinated  soda  can  be 
used  to  distinguish  thymol  from  carbolic  acid ;  but  an  excess  of  the 
reagent  must  be  avoided,  as  in  this  case  carbolic  acid  causes  a  precipi- 
