452  Gleanings  from  the  European  Journals.  |AM'octi"  i872RM" 
50°C,  1  equivalent  of  hydrated  oil  of  turpentine,  C20H164HO  with  2 
equivalents  of  bromine,  when  a  thick  liquid  of  the  consistence  of 
concentrated  glycerin  is  obtained,  containing  two  bromated  com- 
pounds, as  yet  little  known.  On  distilling,  a  large  quantity  of  hydro- 
bromic  acid  is  disengaged  ;  the  distilled  liquid  is  boiled  for  two  hours 
over  fragments  of  potassa  and  then  subjected  to  fractional  distilla- 
tion ;  the  liquid  distilling  between  176°  and  179°C.  presents  all  the 
characteristics  of  cymen ;  it  is  colorless,  limpid,  of  a  penetrating 
lemon  odor,  a  specific  gravity  of  0.864  and  the  composition  C^H^. — 
Journ  de  Pharm.  et  de  Chim.,  1872,  Aug.,  148. 
Waterproof  packing  cloth  which  does  not  break  is  made  by  cover- 
ing the  fabric  with  the  following  varnish  :  2  lbs*  soft  (potash)  soap  is 
dissolved  in  water  and  mixed  with  an  aqueous  solution  of  sulphate  of 
iron.  The  washed  and  dried  iron  soap  is  dissolved  in  3  lbs.  of  linseed 
oil,  in  which  one-fifth  lb.  of  caoutchouc  has  been  previously  dissolved. 
—Chem.  Centralb.,  1872,  No.  29,  from  Polyt.  Notizbl. 
Cralv autoplastic. — To  avoid  the  tedious  process  of  rubbing  plumbago 
over  the  surface  of  plaster  or  gutta  percha  moulds,  Heeren  proposed 
some  years  ago  to  saturate  the  plaster  moulds  with  wax,  paint  it  thinly 
with  solution  of  nitrate  of  silver,  and  expose  it  to  the  action  of  sul- 
phuretted hydrogen,  the  resulting  sulphide  of  silver  being  a  good  con- 
ductor of  electricity.  The  author  now  suggests  the  following  solution 
as  an  improvement :  1  grm.  nitrate  of  silver  is  dissolved  in  2  grm.  of 
water  ;  to  the  solution  is  added  2J  grm.  ammonia,  sp.  grav.  0.96,  and 
then  3  grm.  of  absolute  alcohol. — Ibid.  No.  32.  from  Mitlheil.  d.  Gew. 
Ver.  Hannover. 
Colored  collodion,  prepared  with  anilin  colors  by  dissolving  them 
in  alcohol  and  adding  to  collodium,  is  far  superior  to  anilin  varnishes 
for  coloring  glass,  mica,  paper,  photographs,  prints,  tinfoil,  &c.  Pic- 
ric acid  and  some  brown  anilin  colors  cannot  be  used  for  this  purpose. 
Anilin  varnishes  are  better  adapted  for  leather,  hard  linen,  feathers 
and  artificial  flowers. — Ibid,  from  Muster,  Ztg.  xxi,  157. 
The  congealing  point  of  bromine  has  been  found  by  H.  Baumhauer 
to  be  — 24.5°C.  ( — 12.1°  F.) ;  the  statements  in  chemical  works  vary 
between  — 7.3  and  — 22°C,  and  doubtless  are  due  to  the  presence  of 
water,  by  which  the  freezing  point  of  bromine  is  raised  in  consequence 
of  the  formation  of  hydrate.  Solid  bromine  is  a  red  brown  crystal- 
line mass. — Zeitschr.  f.  Chem.    New  ser.,  vii.  727. 
