Am'May,'Saim'}  Gleanings  from  the  German  Journals.  225 
(2)  A  dilute  iodine  solution  is  made  by  adding  3  drops  tincture  of 
iodine  and  a  little  potassium  iodide  to  200  cc.  water.  This  reagent 
will  also  detect  /-phenetidine,  although  it  is  not  as  delicate  as  the 
test  above.  If  0-5  gm.  phenacetine  be  briskly  agitated  with  5  cc.  of 
the  .reagent  and  filtered  the  filtrate  will  have  a  red  color  if  the 
phenacetine  contains  the  above-mentioned  impurity.  F.  Goldmann 
modifies  the  last  test  (Reuter's)  by  dissolving  the  phenacetine  in  2  cc. 
alcohol  and  warming  after  the  addition  of  the  iodine  solution. — 
Pharm.  Ztg.y  1 891 ,  185,  192,  208. 
Atomic  weights. — Recent  determinations  of  chromium,  by  C. 
Meinecke,  give  as  a  mean  51-94.  K.  Seubert,  in  his  determinations 
of  the  platinum  metals,  finds  Ruthenium,  101-4;  Rhodium,  1027; 
Palladium,  106-35;  Silver,  107-66;  Osmium,  190-3;  Iridium,  192-5 
Platinum,  194-3;  Gold,  196-7;  Kruss  and  Moradt  find  for  Beryl- 
lium, 9-027. — {Lieb.  Ann.  Chem)  Chem.  Rpt.,  1891,  65  and  77. 
The  manufacture  of  hydrobromic  acid  from  potassium  bromide  and 
sulphuric  acid  can  be  successfully  carried  out  as  follows  :  100  gm. 
coarsely  powdered  potassium  bromide,  and  1 50  cc.  sulphuric  acid, 
sp.  gr.  1-41,  are  moderately  warmed  until  solution  is  effected  and 
then  distilled.  Boiling  commences  at  1 26-1270  C,  the  temperature 
slowly  rising  to  1500  C.  During  this  time  most  of  the  hydrobromic 
acid  distils  over,  by  heating  to  2500  C.  very  little  additional  HBr 
is  obtained.  Traces  of  sulphuric  acid  are  carried  over  in  the  last 
portions ;  if  the  bromide  used  contain  bromate,  the  first  portions  of 
the  distillate  will  contain  bromine,  and  in  the  rectification  of  the 
acid,  the  bromine  is  acted  upon  by  careful  addition  of  sodium  sul- 
phite solution  until  the  acid  is  colorless  before  the  distillation.  The 
first  portion  passing  over  is  a  dilute  acid,  later  at  1260,  an  acid  of 
sp.  gr.  1-49  and  containing  48  per  cent.  HBr  distils  over.  Only 
about  1  per  cent,  potassium  bromide  escapes  decomposition,  and 
if  the  bromide  be  pure  no  free  bromine  is  found  in  the  distillate. — 
W.  Feit  and  K.  Kubierschky,  Chem.  Ztg.,  1891,  444. 
Salicylic  acidlotion. — 25-0  salicylic  acid,  50-0  glycerin,  925-0  dilute 
alcohol  (68  per  cent.)  5  drops  oil  of  gaultheria  and  one  drop  each 
of  the  oils  of  rose  and  orange-flowers  ;  dissolve  and  filter.  This  is 
used  in  the  cure  of  dandruff,  the  directions  are  as  follows  :  Cleanse 
the  scalp  with  warm  soap-water,  rinse  with  warm  water,  and  dry 
with  a  towel.  Put  two  tablespoonfuls  of  the  lotion  in  a  wine  glass, 
fill  with  warm  water  and  apply  with  a  sponge  ;  after  removing  exces- 
sive liquid,  cover  the  scalp  for  ^  hDur  with  a  cloth.  — E.  Dieterich, 
Pharm.  Centralhalle,  1891,  147. 
