426 
Book  Review. 
I  Am.  Jour.  Pbarm. 
\  September,  1909. 
dibrombehenic  acid  thus  obtained  into  the  calcium  salt.  Sabromin, 
the  trade  name  for  the  resulting  compound,  occurs  as  a  colorless, 
odorless,  and  tasteless  powder  claimed  to  contain  29  per  cent,  of 
bromine  and  about  3.8  per  cent,  of  calcium.  It  is  insoluble  in  water 
and  alcohol  but  soluble  in  ether,  acetone,  benzol  and  carbontetra- 
chloride. — /.  Amer.  Med.  Assoc.,  1909,  v.  52,  p.  1407. 
Solubilities  of  Salicylates. — Atherton  Seidell  has  determined  the 
solubilities  of  the  official,  U.S. P.,  salicylates  in  water,  alcohol,  and 
in  varying  mixtures  of  these  two  solvents.  His  results  indicate 
that  some  at  least  of  the  officially  stated  solubilities  are  in  error  and 
that  there  is  a  need  for  much  careful  work  in  connection  with  the 
solubility  factor  of  official  articles. — Chem.  and  Drug.,  1909,  v.  74, 
p.  881. 
Scammony. — J.  YVarin  reports  the  occurrence  of  an  imitation 
scammony  produced  by  the  admixture  of  scammony  resin  wTith 
various  substances.  He  outlines  a  number  of  tests,  notably  one 
with  sulphuric  acid  which  is  said  to  yield  a  red  coloration  with  the 
synthetic  product  but  not  with  genuine  scammony. — Apoth.  Ztg., 
1909,  v.  24,  p.  490. 
Tragacanth. — H.  Runne  discusses  the  testing  of  tragacanth  and 
points  out  that  this  substance  contains  starch  that  can  readily  be 
demonstrated  under  the  microscope  by  means  of  an  iodine  potassium 
iodide  solution.  The  amount  of  starch  present  is  small  and  the 
resulting  reaction  with  iodine  is  not  readily  demonstrated  to  the 
naked  eye.  For  detecting  the  admixture  of  acacia  he  outlines  a 
number  of  color  reactions  that  are  characteristic  of  the  oxydase 
present  in  gums  of  the  acacia  type. — Apoth.  Ztg.,  1909,  v.  24,  pp. 
389-39I- 
BOOK  REVIEW. 
i 
A  Manual  of  Volumetric  Analysis.  For  the  Use  of  Pharma- 
cists, Sanitary  and  Food  Chemists,  as  well  as  Students  in  These 
Branches.  By  Henry  W.  Schimpf,  Ph.G.,  M.D.  Fifth  edition, 
8vo,  xx  -f  725  pages,  illustrated,  cloth  $5.00. 
This  work  is  a  rewritten  and  much  enlarged  edition  of  the 
author's  "Text-book  of  Volumetric  Analysis,"  an  effort  being  mad? 
to  bring  the  book  up  to  date  in  regard  to  methods  of  analysis.  It 
is  divided  into  four  parts,  the  first  of  which  includes  general  prin- 
