330  NOTE  ON  SOLANINE,  AND  ITS  DERIVATIONS. 
It  therefore  became  interesting  to  determine  the  equivalent 
of  solanine,  in  order  to  establish  its  formula.  Not  having  been 
able  to  arrive  at  this  result  by  the  analysis  of  the  salts,  which 
are  all  amorphous  and  gummy,  we  deduced  it  from  that  of  its 
derivatives. 
Ethylsolanine  is  obtained  by  heating  to  120°  C.  (248°  F.)  in 
a  sealed  tube,  an  alcoholic  solution  of  solanine  and  iodide  of 
ethyle,  and  precipitating  by  the  product  of  the  reaction  with 
ammonia.    Representing  the  formula  of  solanine  by — 
Q42  H35  NQ14  . 
that  of  ethylsolanine  would  be — 
C42  H34  (C4  H5j  NOU=C4G  H39  NO14. 
Adopting  the  formula  proposed  by  M.  Blanchet,  that  of  ethyl- 
solanine would  be — 
Q88  H72  NQ28. 
The  following  are  the  results  of  the  analyses  of  ethylsolanine, 
with  regard  to  the  theoretical  data  furnished  by  our  formula,  and 
by  that  of  M.  Blanchet  :— 
Experiment.         Calculation.  Calculation. 
(C40  H39  NQ14^   (Q83  H72  NQ28) 
Carbon      .    .    62-26  62-58  63-12 
Hydrogen  .    .      8-85  8-8  8-59 
Nitrogen   .    .        "  3-17  1-6T 
Oxygen     .    .       "  25-39  26-62 
According  to  these  numbers,  which  agree  much  better  with 
our  formula,  we  think  that — 
C42  H35  N0M 
should  be  adopted  as  the  formula  of  the  alkaloid  of  dulcamara. 
Ethylsolanine  is  a  white  substance,  amorphous  in  appearance, 
but  observed  with  the  microscope,  it  appears  to  be  composed  of 
a  mass  of  tangled  crystals.  It  is  without  odor,  has  a  bitter  taste, 
is  insoluble  in  water,  and  soluble  in  alcohol.  All  the  salts  are 
very  soluble  and  gummy  ;  they  are  very  poisonous,  and  give  rise 
to  the  same  symptoms  as  solanine. 
Amylsolanine  is  obtained  like  the  foregoing  body,  substituting 
iodide  of  amyle  for  iodide  of  ethyle.    Its  formula  is — 
Q42  H34  ^10  HTL)  NOU  =  052  H45  NO14. 
