%rii\"9^:}        The  Fat  of  Momordica  Seeds.  243 
In  this  experiment  there  was  no  agglomeration,  and  the  only 
change  in  form  was  the  appearance  of  small,  white  points  in  the  green 
exposed  surface. 
C. — 3.9894  Gms.,  Bxposkd  to  Light  in  Nitrogen. 
For  a  period  extending  over  seven  days  no  change  in  weight  took 
place. 
From  the  above  figures  it  is  evident  that  the  change  observed  is 
one  of  oxidation,  which  is  immensely  accelerated  by  the  presence  of 
light,  sii;ce  in  that  experiment  in  which  the  fat  was  excluded  from 
light  the  change  was  extremely  small,  and  only  affected  the  most 
exposed  portions.  The  effect  that  this  oxidation  has  upon  the  solu- 
bility of  the  fat  in  the  ordinary  solvents  was  next  ascertained.  The 
data  are  tabulated  below,  and  will  again  show  that  there  was  prac- 
tically no  change  when  the  fat  was  kept  in  the  dark: 
Petroleum  Carbon  Alcohol 
Spirit.  Ether.  Tetrachloride.  (97%). 
Original  fat   Soluble  Soluble  Soluble  Insoluble 
Exposed  in  light ....    Insoluble         Insoluble         Insoluble  Insoluble 
Exposed  in  dark. ..  .    Faintly  opal-  Faintly  opal-  Faintly  opal-  Insoluble 
escent  solution  escent  solution  escent  solution 
Lastly,  the  effect  of  heat  upon  the  appearance  and  properties  of 
the  fat  was  observed. 
A. — 3.5712  Gms.  Exposed  to  Air  and  Light  at  ioo°  C. 
Time  of  Exposure  Gain  per  Gramme 
in  Days.  Actual  Gain.  per  Day. 
1   O.1912  0.05652 
2   0.0614  0.03714 
3   0.0140  0.00392 
4   nil  nil 
At  this  point  the  weight  of  the  film  had  become  constant,  in- 
dicating that  complete  oxidation,  and  other  change,  if  any,  had 
occurred  during  the  period  of  three  days.  The  appearance  of  the 
heated  film  was  markedly  different  from  that  of  the  film  exposed  at 
atmospheric  temperature.  The  green  color  was  lost  and  the  fat 
assumed  a  granular,  gelatinous  form,  of  a  pale  brown  color,  finally 
becoming  stiff,  and  easily  disintegrated.  The  effect  of  heating  during 
oxidation  was,  as  in  the  case  of  oxidation  at  ordinary  temperatures, 
to  render  the  product  insoluble  in  the  fat-solvents,  petroleum  spirit, 
