Am.  Jour.  Pharm.  }_ 
February,  1921.  ) 
Cassaba  and  Honey  Dew  Melons. 
109 
HISTOLOGY  OF  THE  CASSABA  MELON. 
This  fruit,  being  the  product  of  the  ripening  of  the  combined 
receptacle  and  inferior  ovary,  presents  for  microscopical  examina- 
tion two  distinct  regions,  viz.,  pericarp  (receptacle  and  ovarian 
wall)  and  seed. 
1.  The  pericarp  in  surface  view  shows  numerous  for  the  most 
part  polygonal  cells,  the  vertical  walls  of  which  are  considerably 
thickened.  Scattered  through  this  region  are  abundant  stomata 
whose  guard-cells  are  surrounded  by  5  more  or  less  crescent-shaped 
neighboring  cells  (Fig.  6).  The  walls  of  the  stomatal  apparatus 
are  colorless.  In  transverse  view  the  epicarp  cells  (Fig.  5),  are 
palisade-like  and  form  a  layer  up  to  80  microns  thick.    The  outer 
Fig.  5.  Transverse  section  of  portion  of  pericarp  of  Cassaba  Melon.  Epicarp  with 
rod-thickenings  in  the  radial  walls  (ep) ;  mesocarp  (mes) ;  pitted  parenchyma  (p) ;  spiral 
tracheae  (t),  (magnified). 
half  of  most  of  the  vertical  walls  of  these  cells  is  greatly  thickened, 
while  the  inner  half  is  for  the  most  part  thin  walled.  Occasionally 
thickening  of  the  vertical  wall  extends  nearly  or  quite  the  com- 
plete length  of  the  cell. 
A  considerable  number  of  uniserate  non-glandular  hairs,  up  to 
PERICARP  (FIG.  5). 
