CHEMICAL  RESEARCHES  ON  AMYLENE. 
418 
water,  in  order  to  remove  the  chloride,  there  will  be  found  after 
the  evaporation  of  this  water,  a  residuum  of  the  chloride  of  zinc, 
of  one-tenth  of  the  weight  of  the  oil  which  has  been  withdrawn. 
Thus  a  gramme  of  the  concrete  chloride  of  zinc  dissolves  in  ten 
grammes  of  the  potato-oil. 
II.  — A  particle  of  the  oil  which  has  remained  on  a  particle  of 
the  chloride  of  zinc,  is  colored  in  a  few  minutes,  and  before  the 
next  day  a  great  part  of  the  oils  is  carbonized ;  and,  therefore, 
in  the  concrete  and  cold  state,  this  salt  acts  strongly  on  the 
potato-oil. 
III.  — When  the  oil  is  impregnated  with  only  little  fragments 
of  the  dry  chloride  of  zinc,  and  left  to  react  for  an  hour,  and  if 
then  a  little  water  be  added,  the  latter  uniting  with  the  chloride 
will  immediately  produce  sufficient  heat  to  disengage  light 
bubbles,  the  odor  of  which  seems  to  approach  very  nearly  to  that 
of  amylene. 
IV  An  oily  solution,  saturated  with  the  chloride  of  zinc,  as 
in  the  first  experiment,  does  not  become  carbonized.  If  we 
shall  have  made  such  solution  several  days  previously,  the  ele- 
ments of  the  oil  will  now  be  found  to  have  become  slowly  modi- 
fied and  disposed  to  give  out  a  greater  quantity  of  amylene  by 
distillation.  I  am  informed  that  M.  Hepp  has  also  observed 
the  same  fact. 
V,  — After  many  days  preparation,  I  have  made  the  distillation 
without  adding  anything  to  the  above  saturated  solution.  I  have 
obtained  a  product  which  was  not  pure  amylic  alcohol,  nor  was 
it  amylene,  or  at  least  there  was  but  very  little  of  the  latter 
present. 
VI.  — 'Seeing  that  the  quantity  of  the  chloride  of  zinc  dissolved 
by  the  amylic  alcohol  was  not  sufficient  to  transform  it  into  the 
hydro-carburets,  I  introduced  into  the  cucurbit  of  a  little  copper 
alembic,  placed  in  a  sand-bath,  dry  chloride  of  zinc  to  the  amount 
of  about  the  one-sixth  the  weight  of  the  amylic  alcohol  employed. 
I  poured  on  this  chloride  a  sufficient  quantity  of  amylic  alcohol 
to  cover  it,  the  alcohol  having  previously  been  saturated  with  the 
chloride,  and  the  head  of  the  alembic  being  well  luted  and  con- 
nected by  means  of  a  caoutchouc  to  another  tube  descending 
from  a  glass  reservoir  with  a  stop-cock,  and  which  contained  the 
remainder  of  the  amylic  alcohol.    On  the  other  side,  I  put  a  re- 
