564 
Some  American  Galls. 
Am.  Jour.  Pharm. 
Nov.,  1890. 
and  submitted  to  the  action  of  the  various  plant  solvents  in  succes- 
sion, with  the  following  results : 
Per  Cent. 
Soluble  in  petroleum  ether,   0*84 
"       stronger  ether,   ito 
"       absolute  alcohol,   21*32 
"      water,   34 '90 
"       dilute  soda  solution,   12*36 
"       dilute  hydrochloric  acid,   3*02 
Moisture,   7*00 
Ash,   r8o 
Cellulose  and  lignin,   17 -41 
9975 
The  absolute  alcohol  extract  was  composed  of  7-56  per  cent,  tan- 
nin, 677  per  cent,  glucose,  575  per  cent,  phlobaphene  and  1-24  per 
cent,  undetermined.  The  aqueous  extract  was  made  up  of  2376 
per  cent,  tannin,  7-88  per  cent,  glucose,  071  per, cent,  saccharose 
and  2- 5  5  per  cent,  mucilage. 
The  tannin  of  these  galls  was  investigated  and  found  in  many- 
particulars  to  resemble  gallotannic  acid,  but  there  were  several 
points  of  difference,  so  that  more  material  must  be  obtained  and 
the  experiments  repeated  before  the  results  can  be  offered  for  pub- 
lication. 
Another  gall  was  also  collected  in  August  from  the  leaves  of 
Quercus palustris,  pin  oak,  and  stated  by  Mr.  Howard  to  have  been  pro- 
duced by  Holcaspis globulus,  Fitch.  They  yielded  when  fresh  3-91  per 
cent,  of  tannin,  077  per  cent,  ash  and  5873  per  cent,  moisture. 
This  when  calculated  without  moisture  shows  9-49  per  cent,  tannin 
and  1-87  per  cent.  ash.  This  tannin  differed  in  many  ways  from 
gallotannic  acid,  but  further  statements  concerning  it  are  likewise 
reserved  for  the  present. 
About  the  same  time  the  above  were  collected,  a  few  galls  were 
found  on  the  leaves  of  Rhus  glabra,  but  the  insect  producing  them 
was  not  identified.  Unlike  the  oak  galls,  they  were  hollow,  and  in 
many  other  respects  they  resembled  the  commercial  Chinese  galls. 
They  were  somewhat  pear-shaped,  nearly  as  large  as  the  Chinese 
variety,  but  were  externally  of  a  greenish  color,  and  became  brown 
on  drying. 
They  were  not  assayed  until  they  had  become  air  dry,  and  were 
•.then  found  to  contain  6170  per  cent,  of  tannin,  2-04  per  cent,  of 
