Amju°iy"i898arm'}     Volatility  of  Some  of  the  Newer  Remedies.  335 
The  tissues  of  the  bract  much  resemble  those  of  the  leaf,  save  that 
the  palisade  cells  are  wanting  and  the  epidermis  has  a  tendency  to 
become  papillae-like.  The  epidermal  cells  are  much  larger  in  size 
compared  to  the  cells  of  the  remainder  of  the  leaf.  The  loose 
parenchyma  consists  of  about  three  rows  of  cells.  The  stomata 
occur  only  upon  the  lower  (dorsal)  portion  of  the  epidermis,  as  in 
the  leaf.    The  "  Nebenzellen  "  of  the  stomata  are  likewise  four. 
The  structure  of  the  whole  plant  is  interesting  from  a  botanical 
standpoint.  The  peculiarity  of  the  marked  contrast  in  the  thicken- 
ing of  all  the  cells  of  the  leaf,  as  well  as  the  cylinder  sheath,  and  the 
presence  of  mucilage,  lead  to  the  conclusion  that  this  plant  pos- 
sesses an  arrangement  for  carrying  on  the  work  of  transpiration  that 
is  peculiarly  its  own. 
DESCRIPTION  OF  FIGURES. 
Fig.  1 — Upper  portion  of  stem  with  leaves  and  inflorescence  in  the  axils. 
Fig.  2. — Portion  of  creeping  stem  producing  roots  at  the  nodes. 
Fig.  3.— Transverse  section  of  stem,  for  description  of  which  see  text. 
Fig.  4. — One  of  the  fibro-vascular  bundles  just  within  the  cylinder  sheath. 
Fig.  5. — Transverse  section  of  stem  showing  a  stoma. 
Fig.  6. — Transverse  section  of  leaf  showing  a  stoma  upon  the  under  surface. 
Fig.  7. — Transverse  section  of  bract  with  a  stoma  upon  the  lower  surface. 
Fig.  8. — Various  forms  of  crystals  of  calcium  oxalate,  found  principally  in 
the  stem. 
Fig.  9. — Starch-grains,  mostly  single,  sometimes  compound. 
THE  VOLATILITY  OF  SOME  OF  THE  NEWER 
REMEDIES.1 
By  Frank  X.  Moerk,  Ph.G. 
Two  years  ago,  in  making  some  experiments  relative  to  the  paper 
read  at  the  meeting  of  this  association,  the  writer  noticed  the  forma- 
tion of  crystalline  sublimates  when  Exalgin,  Acetanilid,  Methacetin 
and  Phenacetin  were  heated  in  an  air-bath  to  temperatures  consider- 
ably below  their  melting  points.  At  different  times  since  then  a 
more  detailed  study  was  undertaken,  but  had  to  be  discontinued 
owing  to  pressure  of  other  work ;  during  the  past  month,  however, 
considerable  experimental  work  has  been  done  on  this  subject,  and 
the  results  are  presented  in  this  paper. 
xRead  at  the  Meeting  of  the  Pennsylvania  Pharmaceutical  Association, 
June,  1898. 
