RESEARCHES  ON  THE  CONSTITUTION  OF  QUINIA.  323 
and  leaves,  on  being  evaporated  in  contact  with  the  air,  a 
crystallized  carbonate  which  has  an  alkaline  reaction  even  after 
becoming  saturated  with  carbonic  acid. 
This  base,  which  I  call  ethyle-quinine,  could  not  be  obtained  fit 
for  analysis  ;  in  its  amorphous  state  it  dries  with  too  much  dif- 
ficulty, and  when  I  tried  to  dry  it  at  120°  C,  it  generated  the 
smell  of  chinolin  and  had  other  properties  not  existing  before, 
being  insoluble  in  water,  and  on  analysis  yielding  products  different 
from  quinine  and  the  supposed  composition  of  ethyle-quinine.  I 
found  in  this  residue  dried  at  120°  72.6  per  cent,  carbon  and  7.8 
per  cent,  hydrogen,  and  must,  therefore,  reserve  its  analysis  for  a 
future  time. 
On  acids  being  added  to  the  aqueous  solution  of  ethyle-quinine 
and  then  evaporated,  it  yields  salts,  most  of  which  are  crystai- 
lizable.     Some  of  them  I  have  prepared  and  analysed. 
The  aqueous  solution  mixed  with  sulphuric  acid  until  the  latter 
predominates,  leaves,  on  evaporation  in  the  water  bath,  a  syrup 
on  which  absolute  alcohol  is  to  be  poured  to  crystallize  it.  These 
crystals  are  little  soluble  in  alcohol,  and  by  washing  them  with 
it,  may  be  freed  from  any  adhering  acid ;  they  easily  dissolve  in 
water,  but  do  not  recrystallize  after  evaporation  ;  their  solution 
reacts  acidulous,  is  not  changed  by  ammonia,  but  when  concen- 
trated, precipitated  by  potassa,  which  precipitate  is  soluble  in 
pure  water.  When  dried  over  sulphuric  acid,  the  crystals  lose 
at  120°  C,  8.2  per  cent,  water. 
0-  5995  grm.  of  these  crystals,  after  desiccation  at  120°,  pro- 
duced, with  chloride  of  barium  and  hydrochloric  acid,  0-3185 
sulphate  of  barytes,  equal  to  18-2  per  cent,  sulphuric  acid,  which 
is  in  accordance  with  the  formula  Gu  H29  N205,  S03  +  HO  SO. 
-j-4HO,  demanding  17*8  per  cent,  sulphuric  acid  in  the  dry  salt, 
and  7-4  per  cent,  water  of  crystallization. 
Another  sulphate  is  obtained  when  sulphate  of  silver  is  added 
to  the  watery  solution  of  iodide  of  ethyle-quinine,  until  all  the 
iodine  is  precipitated  as  iodide  of  silver.  After  filtration  and 
due  evaporation  crystals  are  formed,  which  are  much  less  soluble 
in  water  than  the  former,  but  readily  so  in  alcohol.  After  being 
washed  with  water  the  crystals  were  used  for  analysis. 
1-  520  grm.  air-dry  crystals  at  110°  C.  lost  0-224  grm.  water, 
or  14-8  per  cent. 
