^F™braa?yPi92im'}      Cassaba  and  Honey  Dew  Melons.  in 
2.  Sclerenchyma,  a  zone  of  3  to  4  layers  rounded  to  ovate 
stone  cells  with  radial  pore  canals.  The  inner  layer  of  these  cells 
becomes  elongated  toward  and  at  the  edges  of  the  seed. 
3.  A  zone  of  one  or  two  layers  of  spherical  to  oval-shaped 
cells  whose  walls  show  reticulate  markings. 
4.  A  zone  of  about  4  layers  of  spongy  parenchyma  cells. 
5.  An  inner  epidermis  of  tangentially-elongated  cells. 
Fig.  7.  Non-glandular  trichome  found  on  epicarp  of  Cassaba  Melon  (greatly  magni- 
fied). 
II.  Persiperm.  A  prominent  yellowish  band  (n)  of  tangen- 
tially-elongated cells,  constituting  the  remains  of  the  nucellus. 
III.  Endosperm.    A  layer  of  aleurone  cells  (al). 
IV.  Embryo,  showing  two  plano-convex  cotyledons  and  a  small 
conical  radicle  toward  the  micropllar  end  of  the  seed.  Each  coty- 
ledon (cot)  in  cross  section  shows  an  epidermis  (e)  of  small  clear 
cells,  2  to  3  layers  of  palisade  cells  (pal)  (the  broadest  zone  being 
toward  the  center),  and  several  layers  of  spongy  parenchyma  (s). 
Sections  cut  through  the  center  of  the  cotyledon  show  3  fibrovas- 
cular  strands  coursing  lengthwise  through  the  spongy  parenchyma. 
Both  palisade  and  spongy  parenchyma  cells  contain  a  large  num- 
ber of  fixed  oil  droplets  and  aleurone  grains  2  to  6.4  microns  in 
diameter. 
GROSS  STRUCTURE  OF  THE  HONEY  DEW  MELON. 
This  fruit  (Figs.  1  and  2)  is  of  large  round  to  oval  shape, 
from  about  5  to  7  inches  long  and  4  to  5  inches  in  diameter.  Its 
outer  skin  is  hard,  smooth  and  whitish.  When  cut,  it  exhibits  a 
thick,  greenish  flesh  (sarcocarp)  up  to  one  and  one-quarter  inches 
in  thickness.  The  flesh  is  of  a  sweeter  and  richer  flavor  than  that  of 
the  Cassaba  melon.  The  seed  .cavity  in  the  center  differs  from  that 
of  the  Cassaba  by  showing  only  3  placentae  (Fig.  4).  Each  of  these 
bear  numerous  compressed  ovate  to  ovate-lanceolate  light  yellow 
seeds  12  to  13  mm.  long.  These  become  shiny  when  placed  in 
water,  due  to  the  formation  of  mucilage  by  the  outer  layer  of  cells 
of  the  seed  coat.  Other  microscopic  characteristics  of  the  seed 
resemble  those  described  under  the  Cassaba  melon. 
