EXPERIMENTS  ON  SPERMACETI  OINTMENT  AND  OLIVE  OIL.  155 
A  COMPOSITION  NAMED  ZEIODELITE, 
A  kind  of  Paste  which  becomes  as  hard  as  Stone,  is  unchaageable  by  the  Air, 
and  being-  proof  against  the  action  of  Acids,  may  replace  Lead  and  other 
sixbstances  for  various  uses. 
By  Joseph  Simon. 
Zeiodelite  is  made  by  mixing  together  19  ft)s.  of  sulphur  and 
42  fibs,  of  pulverized  stoneware  and  glass.  The  mixture  is 
exposed  to  a  gentle  heat,  which  melts  the  sulphur,  and  then  the 
mass  is  stirred  until  it  becomes  thoroughly  homogeneous,  when 
it  is  run  into  suitable  moulds  and  allowed  to  cool.  This  prep- 
aration is  proof  against  acids  in  general,  whatever  their  degree 
of  concentration,  and  will  last  an  indefinite  time.  It  melts  at 
about  120^  Centigrade,  and  may  be  re-employed  without  loss 
of  any  of  its  qualities,  whenever  it  is  desirable  to  change  the 
form  of  an  apparatus^  by  melting  at  a  gentle  heat  and  ope- 
rating as  with  asphalte.  At  110°  Centigrade  it  becomes  as  hard 
as  stone,  and  therefore  preserves  its  solidity  in  boiling  water, 
Slabs  of  zeiodelite  may  be  joined  by  introducing  between  them 
some  of  the  paste  heated  to  200*^  Centigrade,  which  will  melt 
the  edges  of  the  slabs,  and  when  the  whole  becomes  cold  it  will 
present  one  uniform  piece.  Chambers  lined  with  zeiodelite  in 
place  of  lead,  the  inventor  says,  will  enable  manufacturers 
to  produce  acids  free  from  nitrate  and  sulphate  of  lead.  The 
cost  will  be  only  one-fifth  the  price  of  lead.  The  com- 
pound is  also  said  to  be  superior  to  hydraulic  lime  for  uni- 
ting stone,  and  resisting  the  action  of  water. — Journ.  Frank. 
Ir^s.y  from  Lond.  Chem.  News. 
EXPERIMENTS  ON  SPERMACETI  OINTMENT  AND  OLIVE  OIL 
By  Mr.  J.  B.  Barnes. 
On  the  6th  of  October,  1858,  a  paper  by  Mr.  Kichard  Giles, 
of  Clifton,  was  read  in  this  room,  on  the  preparation  of  sper- 
maceti ointment.  Differences  of  opinion  were  expressed ;  Dr. 
Redwood  defended  the  practice  of  using  bleached  olive  oil  in 
this  preparation.  He  stated  that  the  specimens  of  olive  oil 
in  the  museum  of  this  Society  were  always  colorless,  in  conse* 
quence  of  their  being  exposed  to  the  light  in  a  glass  case,  and 
