;o8 
Notes  on  the  Dasheen  and  Chayote.  {a"aJ^**5^ 
inner  layer  are  comparatively  clear,  while  the  middle  layer  is  filled 
with  dense  protoplasmic  contents.  The  innermost  layer  of  cells  of 
this  region  is  the  broadest.,  contains  starch  grains,  and  doubtlessly 
represent  the  epicarp  of  the  ripened  carpellary  wall. 
Passing  from  this  region  toward  the  embryo  will  be  noted  nu- 
merous layers  of  thin-walled  cells  of  rounded  or  irregular  outline, 
whose  lumina  contain  either  protein  or  carbohydrate  contents  or 
both.    This  region  constitutes  the  mesocarp.   It  is  traversed  by  nu- 
OQOODODOD 
II  12 
Fig.  ii.  Surface  section  of  epidermis  of  receptacular  portion  of  Cha- 
3-ote  fruit.  Xote  stoma  (si),  guard  cells  (g),  neighboring  cells  (;.').•  and 
crystals  (c)  within  epidermal  cells.    X  40O. 
Fig.  12.  Transverse  section  of  a  representative  portion  of  a  spine  of 
Chayote  fruit.  Epidermis  (ep),  thick-walled  cells  of  cortex  (c)  and  vascu- 
lar tissue  (/).    X  75- 
merous  bi-collateral  bundles.  The  endocarp  consists  of  a  layer  of 
rather  small  tangentially  elongated  cells.  Over  that  portion  of  this 
region  which  is  unattached  to  the  seed  coat  (Fig.  7),  the  cells  are 
larger  and  have  very  thick  brownish  walls. 
Seed. — The  seed  coat  is  composed  of  tangentially  elongated  cells, 
the  outer  walls  of  which  are  united  firmly  to  a  portion  of  the  en- 
docarp. 
Cotyledons. — The  outer  covering  tissue  or  epidermis  consists  of 
a  layer  of  cells,  which,  in  surface  view  are  polygonal,  and  rectangu- 
