170  Cortex  Juglandis  Cinerece.  { AMAp?uiB;  i?87tRM* 
Trommer's  test  indicated  sugar  in  the  infusion,  which  bad  dissolved 
about  one-sixth  of  the  total  weight  of  the  bark,  and  separated  on 
standing  and  evaporation,  some  greenish  resinous  matter.  The  bark 
exhausted  by  cold  water,  yielded  starch  to  boiling  water. 
The  decoction  of  the  bark  resembles  the  infusion,  but  is  destitute 
of  its  acrid  taste.  The  precipitate  with  acetate  of  lead,  when  decom- 
posed by  H2S,  evaporated  and  exhausted  by  alcohol,  furnished  on 
evaporation  an  amorphous  black  residue,  which  was  precipitated  by 
gelatin,  ferric  chloride  and  tartar  emetic,  and  therefore  contains  some 
tannin.  The  filtrate  from  the  lead  precipitate  contained  principally 
sugar. 
The  bark  (gj),  which  had  been  exhausted  with  hot  water  in  preparing 
the  decoction,  was  thoroughly  dried,  and  then  macerated  in  petroleum 
benzin,  in  a  warm  place  for  several  days,  whereby  a  yellow  liquid 
was  obtained,  which,  on  evaporation,  yielded  a  rather  thick  oily  resi- 
due. This  residue,  when  entirely  free  from  benzin,  was  found  to 
weigh  grams  4  58,  which  shows  for  the  bark  a  yield  of  a  trifle 
over  14  per  cent,  of  fixed  oil.  It  has  a  dark  red  color,  slight  odor, 
and  a  peculiar,  slightly  pungent  taste.  At  60°  F.,  it  is  quite  fluid, 
but  between  40°  and  50°  F  ,  becomes  partly  solid,  owing  to  the  sepa- 
ration of  a  crystalline  body,  which  is  probably  stearin.  At  20°  F., 
it  solidifies  into  an  opaque  crystalline  mass.  Its  specific  gravity,  ob- 
tained by  means  of  a  buckshot,  is  0*9  at  55°  F.  The  oil  is  sparingly 
soluble  in  85  per  cent,  alcohol,  almost  entirely  soluble  in  absolute  al- 
cohol, and  freely  soluble  in  ether,  chloroform  and  benzole.  It  is 
readily  saponified  by  KHO,  and,  when  heated  with  the  latter,  yields 
a  clear  violet-colored  solution,  which,  when  diluted  with  water  and 
treated  with  NaCl,  yields  a  brownish  soap  that  separates  and  rises  to 
the  surface. 
Resin. — The  troy  ounce  of  bark,  exhausted  with  hot  water  and 
benzin,  was  thoroughly  dried  and  then  macerated  in  85  per  cent,  al- 
cohol for  7  days.  The  tincture  thus  formed  was  mixed  with  half  its- 
bulk  of  water  and  subjected  to  distillation,  till  the  alcohol  was  mostly 
removed.  From  the  liquid  remaining  in  the  retort,  about  grams  0*2. 
of  a  greenish-brown  resin  was  obtained,  which  weight  does  not  appear 
to  represent  the  whole  amount  of  the  resin. 
It  is  entirely  soluble  in  liquor  potasste,  forming  a  deep  violet- 
colored  solution,  from  which  it  is  precipitated  by  acetic  acid  provided 
the  solution  is  concentrated,  but  if  the  latter  is  diluted  it  is  not  af- 
