256     =-  Gleanings  from  the  German  Journals.  {^"^Mty^mo"^' 
height  m^y  be  obtained.  This  troche  board  forms  a  neat  and*attrac- 
tive  piece  of  furniture  for  the  store,  there  being  no  projections  to  inter- 
fere with  the  working  of  it. 
Section  of  Troche  Board. 
The  Roller  is  so  constructed  that  the  handle  forms  a  continuous  piece^ 
running  through  a  hole  |  of  an  inch  in  diameter;  thus  the  handles  can 
be  firmly  held  while  the  roller  revolves.  Upon  each  end  of  the  roller 
there  is  a  flange,  f  of  an  inch  high  and  i  inch  wide,  keeping:  the  roller 
in  place  upon  the  board,  and  preventing  the  surface  of  the  roller  from 
becoming  soiled  or  bruised  as  the  flanges  raise  it  from  the  point  of 
contact. 
GLEANINGS  FROM  THE  GERMAN  JOURNALS. 
By  Louis  VON  Cotzhausen,  Ph.G. 
Mercury  and  Soft  Paraffin.— E.  Dietrich  corroborates  the  state- 
ment of  Dr.  Weber,  that  mercury  may  be  readily  extinguished  with 
vaselin  under  certain  conditions,  but  states  that  under  the  same 
conditions  an  excellent  ointment  can  be  prepared  with  lard,  simple 
cerate,  old  ointment,  etc.,  which  shows  that  vaselin,  although 
much  more  expensive,  possesses  no  advantages  whatever  over  the 
other  vehicles  ;  on  the  contrary,  old  ointment  is  by  far  preferable, 
because  the  smallest  quantity  of  it  is  required  to  kill  the  cohesion 
of  the  mercury,  as  can  be  proved  by  mixing  50  parts  of  it  with  100 
parts  mercury,  when  it  will  yield  quite  an  uniform  and  satisfactory 
ointment,  which  is  not  the  case  with  any  of  the  other  vehicles,  includ- 
ing vaselin. — Pharm.  Ztg.^  Feb.  28,  1880,  p.  125. 
E.  Dietrich's  New  Mustard  Plasters  are  spread  on  paper,  shirt- 
ing and  silk,  and  are  highly  recommended  by  C.  A.  Jungclaussen,  who 
states  that  while  being  fully  as  flexible  as  American  mustard  plasters, 
they  are  much  quicker  and  energetic  in  their  action.  He  further 
remarks,  that  by  extracting  an  American  mustard  plaster  with 
petroleum    ether,    decanting,    and    washing    the    residue,  Dietrich 
