GLEANINGS  FROM  GERMAN  JOURNALS. 
115 
tartaric  acid,  6  grm.  (1  equiv.)  anhydrous  sulphate  of  mag- 
nesia, and  16.5  grm.  (3  equiv.)  of  chloride  of  ammonium.  With 
other  proportions,  ammonia  produces  a  precipitate  containing 
besides  ammonio-phosphate  of  magnesia,  also  basic  tartrate  of 
magnesia. — (Ann.  d.  Ch.  und  Ph.  xxv.  164.) 
Silieon  in  iron. — The  black  residue  left  after  dissolving  crude 
iron  in  muriatic  acid,  was  found  by  Schafhautl  to  evolve  hydro- 
gen with  ammonia.  Woehier  has  proved  it  to  contain  oxide  of 
silicon  (Ann.  d.  Chem.  und  Ph.  xxviii.  374.) 
V^ratric  acid=  CigHi^Og,  according  to  W.  Merck,  yields  with 
strong  nitric  acid  yellow  nitro-veratric  acid  G^oHgN0^2j  which  is 
soluble  in  water,  crystallizes  from  alcohol  and  yields  binitrovera- 
tric  acid  with  more  NO^.  By  heating  moderately  with  3  parts 
of  baryta,  veratrol=  CigHj^O^  is  obtained,  which  has  an 
aromatic  odor,  crystallizes  at  15^  (59°  F.),  possesses  the  spec, 
grav.  of  1.086,  boils  between  202  and  205°  (396  to  40P  F.);  it 
yields  with  fuming  nitric  acid  nitro-  and  binitroveratrol,  and  with 
bromine  bibromoveratrol  =  Gj^oH^Brfi^ — (Annal.  d.  Ch.  und  Ph. 
xxxii.  58 — 62.) 
Panis  laxans,  or  laxative  cake,  is  prepared  by  painting  the  un- 
derside of  small  biscuits  with  an  alcoholic  solution  of  jalap-resin, 
and  covering  the  place  with  a  thin  layer  of  a  mixture  consisting 
of  beaten  albumen,  sugar  and  a  little  tragacanth ;  each  cake  to 
contain  2  gr.  of  resin.  The  dose  as  a  mild  laxative  is  2  or  3 
cakes  for  a  grown  person,  1  for  a  child  from  6  to  8  years,  &c. 
— (Pharmac.  Centralhalle  i.  No.  12.) 
Tin  in  vinegar  Investigations  caused  by  the  State  authorities 
in  Potsdam  have  developed  the  fact,  that  pure  vinegar  carried  in 
bright  tin  measures  from  the  cellar  to  the  store  contained  a 
small  quantity  of  tin,  which  increased  on  standing  and  was  con- 
siderable after  boiling.  Tin  measures  may  probably  be  fre- 
quently the  cause  of  the  deleterious  effects  of  vinegar,  looked 
for  in  other  circumstances. — (Arch.  d.  Med.  Ges. — Arch.  d. 
Pharm.  cli.  115.) 
Suppositories. — Dr.  Pfeiffer  prepares  them  as  follows  :  cacao- 
butter  or  suet  is  fused  with  J  white  wax  and  moulded.  Im- 
