SULPHOCAKBOLIC  ACID  AND  THE  SULPHOCARBOLATES.  209 
more  in  weight  (till  all  moisture  is  driven  off),  it  is  customary  to 
put  it  on  the  scales  from  time  to  time,  to  ascertain  if  the  requi- 
site point  has  been  reached.  This  is  very  troublesome,  and 
Prof.  Wittstein  proposes  somewhere  to  dispense  altogether  with 
the  repeated  weighings  by  covering  the  capsule,  crucible  (or  what 
else  implement  is  used)  from  time  to  time  with  a  dry  glass  plate. 
The  glass,  being  always  a  good  deal  cooler  than  the  capsule,  etc., 
condenses  the  vapors  of  moisture  to  quite  large  drops.  As  long 
as  the  glass  becomes  in  the  least  bedewed  all  the  moisture  has 
not  been  driven  away.  When  the  glass  remains  dry  and  clean 
then  you  may  put  the  capsule,  etc.,  on  the  scales,  and  you  will 
always  find  that  the  stable  point  has  been  reached. 
Frothy  Syrups. 
Now  approaches  the  time  when  soda  water  flourishes,  and  the 
following  may  be  of  use  to  some  :  As  a  good  froth  is  desirable, 
hitherto  the  addition  of  a  little  gum  arable  has  been  recom- 
mended ;  aside  from  the  trouble  of  dissolving  it,  it  does  not  pro- 
duce a  consistent  foam  with  acid  syrups  (syr.  lemon  for  instance.) 
I  learnt  in  California  the  use  of  white  of  eggs.  One  white 
shaken  with  one  and  a  half  to  two  gallons  cold  syrup  is  suffi- 
cient ;  it  produces  a  persistent  foam  and  imparts,  besides  (ac- 
cording to  my  palate  at  least),  a  rich,  creamy  flavor. 
FJdlada.,  April  btlu  H.  M.  W. 
ON  SULPHOOARBOLTC  ACID  AND  THE  SULPHOCARBO- 
LATES. 
By  T.  Omar  Gut. 
(Extracted  from  an  Inaugural  Essay  presented  to  the  Philadelphia  College  of 
Pharmacy.) 
These  chemical  combinations  have  quite  recently  come  before 
the  medical  world  as  new  therapeutical  agents,  but  have  not  been 
thoroughly  investigated.  There  having  been  no  satisfactory 
process  given  for  their  manufacture  the  subject  was  presented 
to  me  several  months  ago  for  investigation  ;  since  which  time  I 
have  experimented  with  various  combinations,  and  find  the  fol- 
lowing to  give  the  most  satisfactory  results  : 
SulpJiocarholic  Acid. 
This  is  first  formed  by  combining,  by  aid  of  heat,  sulphuric 
14 
