^bS^fSKT"}    Urethanes  of  Thymol  and  Carvacrol, 
Honey  Dew  Melon  Cassaba  Melon 
Total    weight    1388.3  grams  3316.9  grams 
Wt.  of  seeds  and  placenta  .  .  87.       "  293.  " 
Wt.  of  rind   . . .'   680.       "  1360.  " 
Total  refuse    767.4     "  1653.  " 
Amount  of  edible  portion  .  .  .  45%  50% 
Composition  of  pulp. 
Moisture    90.52%  89.05% 
Ash    0.52%  0.80% 
Crude  fiber    0.36%  0.54% 
Protein   0.51%  1.21% 
Reducing  sugar  before  inv.  . .  2.05%  1.87% 
"     after       "    . .  4.04%  2.76% 
Fat  ......   none  none 
BIBLIOGRAPHY. 
1.  Annales  des  Sciences  Naturelles,  4th  ser.,  vol.  2,  1859. 
2.  Origin  of  Cultivated  Plants,  by  De  Candolle,  p.  261,  1885. 
3.  Encyclopedia  Brittanica,  ed.  2,  vol.  18,  p.  98. 
4.  Ijerball,  p.  772,  1597. 
5.  standard  Cyclopedia  of  Horticulture,  3rd  ed.,  vol.  2. 
908,  1919. 
Botanical  Research  Laboratory. 
Philadelphia  College  of  Pharmacy  and  Science. 
June  21,  1920. 
11 
URETHANES  OF  THYMOL  AND  CARVACROL. 
By  D.  C.  L.  Sherk. 
PHENYL  URETHANES. 
The  preparation  of  urethanes  is  an  addition  reaction  between 
an  alcoholic  hydroxyl  and  an  isocyanate.  The  reaction  takes  place 
in  this  manner : 
c=o    —  c=o    +        _  c=o 
No.  7?' 
v  '    N  v  '        *  v  ' 
forming  an  ester  of  carbamic  acid,  NH2CO.OH.  The  urethanes 
have  been  widely  used  in  the  characterization  of  hydroxyl  deriva- 
tives, primary,  secondary  and  tertiary. 
