18 
GLEANINGS  FROM  FOREIGN  JOURNALS. 
Point  of  ebullition  of  pure  glycerin,  262°  F. 
"  "  glycerin  and  water,  equal  parts,    215'6  " 
"  "  glycerin  150,  water  100  parts,     223  " 
"  "  glycerin  175,  water  100  parts,      228  " 
— Jour,  de  Pharm.,  Oct.  1868. 
Preparation  and  Properties  of  Tar  Water.  M.  J.  Lefort, 
read  to  the  Academic  de  Medecine  on  June  9th,  1868,  an  elabo- 
rate paper  on  tar  water,  now  so  much  in  vogue  in  Paris  as  a 
therapeutic  agent.    The  following  conclusions  were  arrived  at : 
1st.  Norway  tar  and  that  of  France  yield  to  water  equal 
quantities  of  soluble  matter. 
2d.  That  medicinal  tar  water  may  be  prepared  with  either 
exotic  or  indigenous  tar. 
3d.  The  semifluid  tar  is  preferable  to  that  that  is  thicker  for 
the  preparations  of  which  this  substance  is  the  base. 
4th.  That  tar  water  prepared  hot,  in  close  vessels,  represents 
better  the  natural  principles  of  tar,  and  is  more  constant  in  its 
composition  than  when  made  cold  and  followed  by  long  macera- 
tion in  contact  with  air. 
5th.  That  tar  water  made  with  heat  contains  a  mean  of  about 
2  parts  in  1000  of  fixed  and  volatile  principles. 
6th.  That  tar  water  contains  principally  pyrogenous  oil  of 
turpentine,  creasote,  volatile  resinoid  principles,  one  or  more 
isomeric  acids  natural  to  turpentine,  and  lastly  acetic  and  oxy- 
phenic  acids. 
7th.  That  tar  water  dissolves  from  5J  to  7  grains  of  iodine  to 
the  pint,  and  that  the  resulting  liquid  retains  its  physical  prop- 
erties containing  iodized  phenic  and  oxyphenic  acids. 
8th.  That  iodized  tar  water  gives  no  indications  to  reagents  of 
the  characters  belonging  to  free  iodine  or  the  iodides. — Jour, 
de  Pharm.,  Sept.,  1868. 
Iodide  of  cadmium  and  potassium  as  a  reagent  for  alkaloids. — 
M.  Marme,^proposes  this  double  iodide  to  precipitate  the  follow- 
ing alkaloids  in  a  very  dilute  solution  in  the  presence  of  sul- 
phuric acid;  nicotina,  conia,  piperina,  morphia,  codeia,  thebaina, 
narcotina,  narceia,  quinia,  quinidia,  cinchonia,  strychnia,  bru- 
cia,  veratria,  berberia,  atropia,  hyoscyamia,  aconitia,  delphinia. 
