436  Extractum  Jalapce  Alcoholicum.  {AmsllZ'wtm' 
were  evaporated  to  the  consistency  of  soft  extracts  over  a  water- 
bath,  dried  at  105 °  C,  weighed,  and  then  exhausted  with  distilled 
water  at  1 5  -  5 0  C.  The  watery  extract  was  evaporated,  dried  and 
weighed.  The  remaining  resin  was  then  treated  with  stronger 
ether  and  the  quantity  of  the  ether-soluble  portion  determined  by 
evaporation  and  weighing.    The  results  were  as  follows : 
Alcoholic  Extract. 
Sample. 
 .  j 
Total. 
1 
Water-Soluble 
Portion. 
Resin  Per  Cent.  • 
Ether-Soluble 
Resin. 
I 
2 
14*583 percent.  | 
15-625  per  cent. 
2 '816  per  cent. 
4*239  per  cent. 
-  - 
1 1*666  per  cent. 
10*386 per  cent. 
1 
12*765  percent. 
9*523  percent. 
The  resin  was  reddish-brown  in  color,  No.  2  being  of  a  darker 
shade  ;  it  had  an  acrid  taste  and  a  neutral  reaction.  One  part  of  it 
dissolved  in  50  parts  of  water  of  ammonia  yielded  a  solution  which 
did  not  gelatinize  on  cooling ;  on  the  addition  of  hydrochloric  acid 
in  excess  a  precipitate  was  produced. 
Jalapurgin,  the  resin  remaining  undissolved  by  the  ether,  was 
brittle,  reddish-brown,  of  a  sweetish,  afterward  acrid  taste,  and  of 
neutral  reaction.  It  was  soluble  in  alcohol,  chloroform  and  in 
potassium  hydrate  solution,  the  latter  solution  having  a  peculiar 
odor. 
The  ether-soluble  resin  was  reddish-brown,  soft,  did  not  harden 
on  standing,  and  was  soluble  in  alcohol  and  potassium  hydrate,  the 
latter  solution  yielding  a  precipitate  on  being  acidulated  with 
hydrochloric  acid. 
Resin  of  jalap  was  also  prepared  by  the  pharmacopceial  process 
by  exhausting  the  powders  with  alcohol,  concentrating  the  percolate 
to  a  small  bulk,  precipitating  with  water,  washing  the  precipitate 
and  drying  at  105  0  C.  The  amount  of  resin  thus  obtained  was  979 
per  cent,  from  sample  No.  1,  and  8*75  per  cent,  from  sample  No.  2. 
The  smaller  yield  by  this  process  is,  probably,  mainly  due  to  the 
more  complete  removal  of  the  extractive  matter  soluble  both  in 
alcohol  and  water. 
Jalapurgin,  as  obtained  above,  when  treated  with  potassium  acid 
chromate  and  sulphuric  acid,  took  an  olive-green  color,  while  the 
