242  SUBLIMING  TEMPERATURES  OF  POISONS. 
without  combustion  or  being  carbonized,  in  white  vapor,  without 
residue.  (No  indication  given  that  the  poison  may  be  sublimed 
prior  to  melting,  and  even  without  melting.) 
3.  Oxalic  Acid. — Melts  and  is  wholly  dissipated.  (Again  no 
statement  that  the  poison  may  sublime  before  melting.) 
4.  Binoxalate  of  Potash. — Leaves  a  white  ash.  (No  allusion 
to  the  fact  that  this  poison  also  sublimes.) 
5.  Arsenic  Acid. — Not  entirely  volatilized.  (An  obviously 
imperfect  description  of  the  effects  of  heat.) 
6.  Acetate  of  Lead. — Leaves  residue  of  yellow  oxide  with  re- 
duced metal. 
7.  Carbonate  of  Lead. — Kesidue  of  yellow  oxide. 
8.  Morphine. — Melts,  darkens,  burns  like  a  resin,  and  depos- 
its carbon.  (No  indication  that  the  poison  partially  sublimes 
before  melting.) 
9.  Strychnine. — Melts,  and  burns  like  resin,  with  a  black, 
smoky  flame.    (No  indication  of  prior  sublimation.) 
10.  Aconitine. — Fuses,  and  burns  with  a  bright  yellow  flame. 
11.  Atropine. — Melts,  darkens,  and  burns  with  a  yellowish 
smoky  flame. 
T  will  now  add  an  equally  short  statement  of  results,  described 
as  commonly  obtained  with  the  reduction-tube,  heated  by  the 
flame  of  the  spirit-lamp. 
1.  Arsenious  Acid. — Sublimed  without  melting,  forming  a 
ring  of  brilliant  octahedral  crystals. 
2.  Corrosive  Sublimate. — Melts,  and  sublimes  as  prismatic 
crystals,  sometimes  stellated. 
3.  Oxalic  Acid. — Melts  ;  vapor  condensed  as  white  crystalline 
sublimate. 
4.  Acetate  of  Lead. — Melts,  becomes  solid,  melts  again, 
darkens,  yielding  vapors  of  acetic  acid,  and  leaves  residue  of 
carbon  and  reduced  lead. 
5.  Tartar  Emetic. — Chars,  but  does  not  previously  melt. 
Metal  partially  reduced.  Residue  has  a  grayish-blue  metallic 
lustre. 
6.  Morphine. — As  with  platinum-foil.  Ammonia  given  off. 
(No  mention  of  any  sublimate.) 
