ADecJemberi™'}      Alcohol  in  Volumetric  Analysis.  669 
The  indicators  used,  the  methods  of  preparing  their  liquid  solu- 
tions, and  the  amounts  of  these  solutions  employed  per  titration, 
were  as  follows :  Brazil  wood,  3  grammes  of  the  cut  wood  were 
boiled  with  10  c.c.  of  water  for  about  five  minutes,  cooled,  decanted, 
and  10  drops  used  per  titration. 
Cochineal,  prepared  according  to  "  Sutton's  Volumetric  Analysis," 
sixth  edition.    Five  drops  used  per  titration. 
Hematoxylin,  I  gramme  dissolved  in  100  c.c.  of  alcohol,  and  3 
drops  used  per  titration. 
Iodo-eosin,  1  gramme  dissolved  in  500  c.c.  of  diluted  alcohol,  and 
5  drops  employed  per  titration. 
Fluorescein,  1  gramme  dissolved  in  100  c.c.  of  50  per  cent,  alco- 
hol, and  10  drops  used  per  titration. 
Lacmoid,  1  gramme  dissolved  in  500  c.c.  of  50  per  cent,  alcohol, 
and  15  drops  used  per  titration. 
Litmus,  prepared  according  to  "  Sutton's  Volumetric  Analysis," 
sixth  edition,  and  10  drops  used  per  titration. 
Methyl  orange  and  tropaeolin  OO,  I  gramme  dissolved  in  1  litre  of 
water,  and  5  drops  used  per  titration. 
Phenolphthalein,  1  gramme  dissolved  in  1  litre  of  diluted  alcohol, 
and  8  drops  used  per  titration. 
Rosolic  acid,  1  gramme  dissolved  in  10  c.c.  of  diluted  alcohol,  and 
made  up  to  100  c.c.  with  water.  Five  drops  were  used  per  titration. 
The  above  indicators  were  selected,  after  testing  them, from  the  best 
material  obtainable  in  the  market. 
The  normal  sulphuric  acid  was  standardized  by  means  of  Weinig's 
method.  A  tenth  normal  acid  solution  was  prepared  from  this.  An 
approximately  normal  alkaline  solution  was.  made  up  from  the  best 
potassium  hydroxide  obtainable,  and  its  factor  established  by  titra- 
ting it  against  the  normal  sulphuric  acid.  Hematoxylin  was  taken  as 
the  standard  indicator.  From  the  normal  alkaline  solution  an  ap- 
proximately fiftieth  normal  solution  was  prepared.  Its  factor  was 
established  by  titrating  it  against  the  tenth  normal  sulphuric  acid. 
The  fiftieth  normal  alkaline  solution  was  used  in  all  of  the  work, 
because  it  has  been  found,  by  careful  experimentation,  that  this 
strength  is  fully  as  well  adapted  to  this  kind  of  work  as  the  centi- 
normal  solution,  if  not  better.  The  writer  thinks  the  end-reaction 
is  slightly  sharper  and  more  decisive.  The  water  was  taken  directly 
from  the  still  after  a  number  of  gallons  were  distilled. 
