190  Gleanings  from  the  German  Journals.  }  km^™;™"m' 
through  a  sieve,  stirring  constantly,  7,500  grams  litharge,  previously 
heated  until  entirely  free  from  carbonic  acid  (/.  e.  until  a  little,  mixed 
with  nitric  acid,  causes  no  effervescence).  Allow  the  mixture  to  stand 
over  night  and  boil  the  plaster  in  the  morning  for  2  to  i\  hours  with  a 
moderate  heat,  without  adding  any  water.  The  author  has  used  this 
formula  for  some  time  past,  and  always  successfully. — Pharm.  Ztg., 
Feb.  1,  1879,  P-  7°- 
Analysis  of  Sapo-Viridis. — Bernbeck  ascertained  an  excellent 
sample  of  green  soap  to  consist  of  14*17  parts  of  caustic  potassa  and 
soda,  44*92  parts  of  oil  (calculated  from  the  oleic  acid  found)  and  40*91 
parts  of  water.  An  alcoholic  solution  left  a  small  residue  consisting 
•of  alkaline  carbonates. — Pharm.  Ztg.,  Feb.  1,  1879,  p.  70. 
Estimation  of  Sulphate  in  Carbonate   of  Sodium.— Dr.  H. 
Klencke  powders  the  salt,  adds  acetic  acid  to  it  until  effervescence 
ceases,  pours  off  the  liquid  and  washes  the  residue  with  fresh  acetic 
acid  ;  all  undissolved  salt  is  Glauber  salt ;  by  drying  and  weighing  this 
the  percentage  of  the  adulteration  is  ascertained. — Pharm.  Ztg.*  Dec. 
25,  1878,  p.  889. 
Constitution  of  Sulphide  of  Copper  Made  by  the  Wet  Process. 
— Julius  Thomsen  made  an  analysis  of  the  precipitate  obtained  from 
solutions  of  oxide  of  copper  by  sulphuretted  hydrogen,  which  proved 
that  it  is  not  cupric  sulphide  (CuS),  but  a  compound  having  the  for- 
mula Cu4S3. — Ber.  d.  Deutsch.  Chem.  Ges.,  1878,  p.  2043. 
The  Unpleasant  and  Offensive  Odor  of  Iodoform  in  mixtures 
with  lard  (1  :  10),  collodium  elasticum  (1  :  10  or  1  :  7),  olive  oil  or  cacao 
butter  (1  :  50)  is  easily  overcome,  according  to  the  statement  of  Dr.  Vul- 
pius,  by  adding  1  to  2  drops  of  peppermint  oil  to  every  10  grams  of  the 
mixture,  which  covers  the  iodoform  odor  entirely. — Pharm.  Ztg.,  Feb. 
12,  1879,  p.  95. 
Presence  of  Iodide  of  Potassium  in  Iodoform. — Iodoform  dis- 
solves readily  in  collodion,  yielding  a  clear,  thick  solution.  On  pre- 
paring such  a  solution  with  iodoform,  apparently  pure  and  answering 
all  tests  of  the  German  Pharmacopoeia,  Jul.  Muller  observed  it  to 
become  as  thin  as  ether  ;  further  investigations  proved  that  this  was 
caused  by  the  presence  of  potassium  iodide  and  iodate  in  the  iodoform. 
— Pharm.  Ztg.,  Feb.  1,  1879,  p.  70. 
