Am.  Jour.  Pharin. 
May,  1892. 
}  Analysis  of  True  and  Commercial  Pareira. 
257 
The  remainder  of  the  alcoholic  percolates  were  evaporated  to 
dryness,  the  resulting  residues  digested  in  water  and  the  mixture 
filtered.  The  solutions  thus  obtained  were  then  divided  into  two 
parts  (A  and  B)  and  a  definite  portion  of  A  evaporated  to  dryness 
to  ascertain  the  amount  of  the  organic  solids  soluble  in  water.  The 
remainder  of  A  was  tested  for  tannin  and  alkaloids,  both  of  which 
were  found  present  in  the  drug. 
The  second  part  (B)  was  then  concentrated  and  neutralized  with 
sodium  carbonate  until  no  further  precipitate  ensued,  the  precipitate 
being  then  dried  and  exhausted  with  ether.  The  ethereal  solutions 
evaporated  to  dryness  and  weighed  gave  the  amount  of  alkaloid 
present. 
The  aqueous  filtrate  after  precipitation  was  neutralized  with  acetic 
acid  and  then  treated  with  acetate  of  lead,  as  recommended  by 
Dragendorff,  but  no  results  worth  mentioning  were  obtained  by  this 
method.  The  residues  from  the  previous  treatment  with  alcohol, 
after  being  dried,  were  exhausted  with  water,  the  percolates  meas- 
ured, and  certain  portions  evaporated  to  dryness. 
From  this  was  ascertained  the  total  solid  residue,  which  amounted 
in  the  case  of  chondodendron  to  11-76  per  cent.,  and  in  the  substi- 
tute to  6-05  per  cent. 
About  10  cc.  of  the  percolates  were  then  mixed  with  twice  their 
volume  of  absolute  alcohol  and  allowed  to  stand  for  twenty-four 
hours,  when  a  large  precipitate  occurred  in  the  liquid  obtained  from 
the  genuine  drug,  showing  that  a  large  quantity  of  mucilaginous 
substances  were  contained  in  it.  The  percolate  from  the  substitute 
showed  scarcely  any  precipitate. 
Percolations  were  also  made  with  dilute  soda  solution  and  dilute 
hydrochloric  acid,  but  they  were  not  carried  far  enough  to  put  the 
results  in  this  paper. 
The  following  table  will  show  the  results  of  our  analyses  by  this, 
process  as  far  as  we  have  conducted  them  : 
Per  cent, 
from  False. 
Moisture  (no0  C),    9-30 
Ash  (containing  Fe,  Al,  Ca,  Na,  and  K,  also  phos- 
8-99 
phates,  sulphates  and  silicates),   4*29 
Fats  and  Fatty  Acids  (petroleum  ether  extract),  .  .  8-67 
Acid  Resin  (ether  extract),  none 
1-32 
0*28 
0*24 
