SUBLIMING  TEMPERATURES  OF  POISONS. 
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which  yield  sublimates  resembling  somewhat  those  of  one  or 
other  of  its  members,  it  would  include  muriate  of  ammonia, 
which  sublimes  at  or  about  210°  Fahr.,  and  yields  a  sublimate 
which  might  be  confounded  with  the  less  denned  forms  of  arseni- 
ous  acid.  The  most  successful  sublimates  of  muriate  of  ammo- 
nia consist  wholly  of  cubes.  Sublimed  from  platinum-foil,  it 
first  crepitates,  and  is  then  dissipated  in  white  fumes. 
2.  Sublimation  without  Change  of  Form  or  Color,  folloived  by 
Melting  with  or  without  Change  of  Color  and  with  farther  Subli- 
mation.— This  class  includes  the  three  poisons — oxalic  acid,  mor- 
phia and  strychnia.  The  first  (oxalic  acid)  sublimes,  then 
melts,  and  is  dissipated  without  residue.  The  second  and  third 
(morphia  and  strychnia)  first  yield  sublimates,  then  melt  and 
darken,  continue  to  sublime,  but  leave  a  distinct  layer  of  carbon. 
These  changes  take  place  at  the  temperatures  indicated  below : — 
Oxalic  acid  sublimes  at  or  about  180°,  melts  at  or  about  280° 
Morphia  "  "       330°,  "  340° 
Strychnia        «  "       345°,  "  430° 
3.  Melting,  Change  of  Color  and  Sublimation. — This  class 
.comprises  all  the  poisonous  alkaloids  and  glucosides,  except  the 
members  of  class  2, — morphia  and  strychnia.  Their  melting 
and  subliming  temperatures  are  given  below,  arranged  in  the 
order  of  their  melting  temperature,  beginning  with  the  lowest : 
Aconitia  melts  at  or  about  140°,  sublimes  at  or  about  400° 
Atropia         "          "       150°       "  "  280° 
Delphinia      "          "       150°       "  "  300° 
Veratria        "          "       200°        "  "  360° 
Brucia          "          "       240°       "  "  400° 
Digitalina      "          "       310°        "  "  310° 
Picrotoxia      "          «       320°       "  "  320° 
Solania         "          "       420°        "  "  420° 
I  add  a  statement  of  the  melting  and  subliming  temperatures 
of  the  members  of  the  opium-series  : — 
Meconina  melts  at  or  about  120°,  sublimes  at  or  about  180° 
Narceia         "          "       170°       "  "  430° 
Paramorphia  "          "       210°        "  *<  320° 
Papaverina    "          "       210°       "  "  310c 
