84 
GLYCEROLE  OF  ALOES. 
On  the  other  hand,  in  order  to  determine  the  cane-sugar  con- 
tained in  the  mixture,  1  grm.  of  the  same  sample  is  weighed  off 
and  dissolved  in  40  cubic  centims.  of  water ;  250  milligrms.  of 
concentrated  muriatic  acid  are  then  added,  and  the  mixture  is 
heated  in  the  water-bath  for  ten  minutes  to  ]29°— 131°  F. ; 
when  it  has  been  neutralized  with  carbonate  of  soda,  it  is  tested 
in  the  manner  previously  described.  The  percentage  of  sugar 
is  now  found  to  be  much  greater  than  before,  the  cane-sugar 
being  converted  into  grape-sugar.  If  the  number  of  cubic  cen- 
timetres of  the  test-fluid  employed  in  the  preceding  test  be  de- 
ducted from  the  number  now  found,  the  difference  gives  the  cen- 
tesimal amount  of  cane-sugar. 
The  author  found  by  experiments  with  mixtures  of  solutions 
of  cane-sugar  and  grape-sugar,  the  amount  of  sugar  contained 
in  each  being  known,  that  they  may  be  determined  by  the  de- 
scribed process  within  JLth  per  cent.  Of  the  organic  acids  which 
may  occur  in  syrups,  he  only  found  two  which,  even  when  com- 
bined with  potash,  are  decomposed  by  the  test-fluid,  and  there- 
fore decolorize  it  like  sugar, — these  are  oxalic  and  tartaric  acids  ; 
on  the  other  hand,  citric  acid,  succinic  acid,  and  acetic 
acid  have  no  action  on  the  test-fluid. 
This  method  of  determining  cane-sugar  and  grape-sugar  evi- 
dently rests  upon  the  same  principal  as  Fehling's  test  for  sugar ; 
if  the  latter  be  arranged  so  as  to  correspond  with  that  described 
by  the  author,  it  gives  a  larger  amount  of  grape-sugar  when 
dextrine  is  present ;  and  the  difference  between  the  results  of 
the  two  tests  is  to  be  ascribed  to  dextrine,  so  that  it  becomes 
possible  to  distinguish  the  cane-sugar,  grape-sugar,  and  dextrine 
in  a  mixture  by  a  volumetric  process. — London  Chem.  Qas. 
from  Dingier 's  Polytechn.  Journal,  clii.  p.  68. 
GLYCEROLE  OF  ALOES. 
By  A.  F.  Haselden. 
This  preparation  was  originally  introduced  by  M.  Chausit,  and 
subsequently  by  the  General  Apothecaries'  Company,  to  the 
notice  of  the  profession.  Thinking  it  possible  and  probable  that 
some  of  the  readers  of  the  Pharmaceutical  Journal  might  meet 
