814 
GLEANINGS  FROM  THE  GERMAN  JOURNALS. 
prevented  by  keeping  it  under  water,  or  by  diluting  it. — (Arch, 
d.  Ph.  civ.  282,  288.) 
To  prevent  the  moulding  of  Plasters  containing  vegetable 
powders,  A.  Hirschberg  recommends  to  heat  the  ingredients  of 
the  plaster  in  a  steam  bath  until  free  of  moisture,  then  add  the 
well  dried  powder,  and  employ  in  spreading  anhydrous  oils. 
The  plasters  are  harder  than  as  ordinarily  made,  a  slight 
increase  of  oil  is  therefore  advisable. — (Arch.  d.  Ph.  ciii. 
165,  16G.) 
Arse7iical  Wall-colors  and  Papers  ^-C.  Fabian,  of  Augsburg, 
reports  the  chemical  examination  of  urine  of  two  patients, 
sleeping  in  rooms,  the  walls  of  which  were  covered  with  paper, 
colored  by  Schweinfurt  green  ;  both  urines  contained  arsenic, 
but  no  copper.  The  physician,  Dr.  Muller,  ordered  the  removal 
of  the  paper,  and  gave  iodide  of  potassium^  when  the  arsenic  at 
first  increased  in  quantity  in  the  urine,  and  finally  disappeared. 
F.  collected  the  dust  from  two  rooms  hung  with  arsenical  paper, 
and  of  two  rooms  washed  with  colors  containing  Schweinfurt 
green,  and  proved  the  presence  of  arsenic  and  copper.  He 
advises  to  discard  all  wall  colors  and  papers  containing  this 
poisonous  metal. — (Archiv  d.  Ph.  ciii.  257-270.) 
Professor  Wittstein  calls  attention  to  the  circumstance  that 
rooms  washed  or  papered  with  arsenical  colors,  frequently  have 
an  alliaceous  odor,  v/hich  he  thinks  is  due  to  the  elimination  of 
metallic  arsenic  by  lime:  5  AsOg^  3  ASO5+2  As.  When  no 
lime  is  present,  the  reduction  must  be  ascribed  to  the  organic 
matter,  glue,  gum,  &c.,  in  the  presence  of  atmospherical  mois- 
ture. Minute  quantities  of  arsenic  will  fill  a  room  with  the 
garlicky  odor. — (Arch.  d.  Ph.  civ.  36-42.) 
Titration  of  Burned  Lime  for  ascertaining  the  amount  of 
Caustic  Lime. — 2.80  grms.  burned  lime  from  different  parts  of 
the  whole  pile,  are  slacked  and  well  mixed.  1-lOth  part  of  it  is 
mixed  with  water  and  50  to  60  grm.  chloride  of  ammonium,  so 
that  the  whole  measures  1000  c.  c.  m.  After  agitation  and 
settling,  10  c.  c.  m.  of  the  clear  liquid  are  estimated  with  normal 
oxalic  acid.  The  results  are  sufficiently  accurate  for  all  techni- 
cal purposes,  a  slight  excess  being  found,  because  the  liquid 
