134 
ON  SOUTHERN  PRICKLY  ASH  BARK. 
tions  from  which  yields  were  obtained,  and  making  the  average 
yield  from  each  retort  5'52  avoirdupois  ounces. 
From  an  article  by  Dr.  E.  E.  Squibb,  Proceed.  Am.  Pharm. 
Association,  1860,  the  following  yield  is  taken  to  compare  the 
yield  at  the  U.  S.  A.  Laboratory, — viz. : 
The  amount  of  sulphuric  acid  used  was  1664  lbs. ;  the 
amount  of  alcohol  was  100J  galls.  —  668  lbs.  The  yield  was 
87  fluidounces,  which,  calculating  the  sp.  gr.  of  the  oil  at  1*1, 
is  about  96  avoirdupois  ounces.  The  number  of  distillations 
was  twenty- one,  making  an  average  for  each  distillation  of 
4*14  fluidounces,  or  4*54  avoirdupois  ounces.  To  make  one 
avoirdupois  ounce  it  required  111  ounces  of  alcohol  and  173 
ounces  sulphuric  acid  sp.  gr.  1*854. 
The  following  table  will  plainly  show  the  difference  of 
results : 
Dr.  E.  R.  Squibb. 
U.S.A.  Laboratory. 
Amount  of  sulph.  acid  required  to 
make  one  avoir,  ounce  of  oil  of 
173  Avoir,  ounces. 
Ill    M  " 
4.54   "  " 
157  Avoir,  ounces. 
70    "  " 
5.52   "  « 
Amount  of  alcohol  required  for  the 
Average  yield  from  each  distilla- 
Proe.  Amer.  Pharm.  Assoc.,  1864. 
ON  SOUTHERN  PRICKLY  ASH  BARK. 
By  Prof.  Robert  Bridges. 
Among  the  questions  proposed  during  the  session  of  the 
American  Pharmaceutical  Association  for  1862  is  the  follow- 
ing: "  What  is  the  true  botanical  source  of  Southern  Prickly 
Ash  Bark ;"  which  was  accepted  by  Professor  Thomas,  and  on 
the  next  meeting,  at  his  request,  "  dropped  for  the  present." 
Professor  Thomas  had,  in  the  mean  time,  however,  endeavored 
to  obtain  specimens  for  the  purpose  of  investigation,  but  with- 
out apparent  success.    One  of  his  friends,  to  whom  he  subse- 
