SULPHO-CARBOLIC  ACID  AND  THE  SULPHO-CARBOLATES.  131 
Good  glycerin  has  now  become  so  low  in  price,  costing  but  from 
thirtj-three  to  thirty-five  cents  per  pound,  that  to  make  use  of 
it  in  the  preparation  of  syrups  adds  but  a  trifle  to  their  expense. 
Twenty-five  per  cent,  of  glycerin,  with  the  proportion  of  sugar 
employed  in  the  above  formula,  will  keep  almost  any  syrup. 
In  estimating  the  additional  cost  of  making  syrup  with  glycerin, 
as  above  directed,  it  must  be  borne  in  mind  that  the  quantity  of 
sugar  required  is  thereby  greatly  reduced.  In  a  quart  of  the 
above  syrup,  but  eighteen  instead  of  thirty  troy-ounces  of  sugar 
are  employed,  consequently  the  glycerin  adds  but  about  ten 
cents  to  the  cost  of  the  whole  product, — a  matter  too  trivial  to 
be  taken  into  account  when  its  advantages  are  considered. 
As  an  addition  to  all  the  pectoral  and  expectorant  syrups, 
glycerin  is  useful  not  only  as  an  antiseptic,  but  also  on  account 
of  its  enhancing,  in  a  measure,  their  medicinal  virtues,  and  as  a 
means  of  diminishing  the  amount  of  saccharine  matter  in  them 
its  advantages  are  obvious. 
PhiladelpJiia,  February^  1870. 
NOTE   ON  SULPHO-OARBOLIC  ACID  AND  THE  SULPHO- 
CARBOLATES. 
By  the  Editor. 
Sulpho-carbolic  acid  and  its  salts  were  among  the  derivatives 
of  phenyl  which  the  fertile  mind  of  Laurent  worked  out  of  the 
products  of  coal  tar  as  early  as  1841,  describing  it  under  the 
name  of  sulpho-phenic  acid.  Only  of  late,  however,  since  car- 
bolic acid  has  had  its  therapeutic  and  antiseptic  properties  more 
fully  developed,  has  the  attention  of  medical  men  been  attracted 
to  this  acid  and  its  salts.  Mr.  C.  H.  Wood,  F.C.S.,  in  a  paper 
published  in  the  Pharmaceutical  Journal  for  January,  1869^  says 
that  Dr.  Sansom  had  shown  to  the  Medical  Society  of  London 
the  sulpho-carbolates  of  potassium,  sodium,  and  magnesium,  and 
recommended  them  as  antiseptics  in  cholera  and  zymo-tic  diseases 
generally  ;  and  that  Mr.  John  Wood,  of  Kings  College  Hospital, 
in  the  Lancet  of  Dec.  7th,  1868,  states  that  sulpho-carbolate  of 
zinc  "is  prescribed  in  aqueous  solution  of  from  8  to  6  grs.  to  the 
ounce  as  an  injection  in  the  treatment  of  gonorrhoea,,  and  also  as- 
a  dressing  for  wounds  and  sores." 
