AMERICAN  PHARMACEUTICAL  ASSOCIATION.  501 
what  are  the  distinctions  between  the  culture  of  grapes  in  this  and  other 
States  ;  and  what  are  the  statistics  in  regard  to  the  amounts  of  wine  pro- 
duced in  this  and  former  years  ? 
Referred  to  Alexander  Leitch,  St.  Louis,  Missouri. 
36.  It  has  been  found  that  Liquor  Ferri  Iodidi  of  the  Pharmacopoeia, 
frequently  assumes  a  brown  color,  and  that  this  color  is  entirely  dissipated 
on  exposure  to  light,  or  may  be  prevented  entirely  by  such  exposure  to 
light  when  first  made.  (See  Amer.  Journ.  Pharm.,  vol.  xxvii.  page  218.) 
Question. — To  what  is  this  change  due,  and  is  it,  by  such  change,  thera- 
peutically affected  ? 
Accepted  by  W.  J.  M.  Gordon,  of  Cincinnati. 
37.  What  is  the  correct  history  of  the  production  and  sources  of  supply 
of  Hemlock  or  Canada  pitch,  of  Balsam  of  Fir,  and  of  Oil  of  Hemlock ; 
and  to  what  extent  are  they  produced  in  New  England  and  Canada  ? 
Continued  to  S.  P.  Peck,  of  Bennington,  Vermont. 
38.  What  are  the  best  vehicles  for  disguising  the  taste  of.Quinia  and  its 
salts,  and  what  the  most  eligible  excipient  for  forming  it  into  pill  mass  ? 
Accepted  by  R.  A.  Payne,  of  Washington,  D.  C. 
39.  The  Silphium  laciniatum,  or  rosin  weed  of  our  western  prairies, 
yields  a  resinous  exudation,  in  appearance  like  mastic.  Question. — What 
is  the  character  of  this  resinous  product,  can  it  be  substituted  for  mastic, 
and  to  what  extent  may  it  be  collected  as  an  article  of  commerce  ? 
Continued  to  Edwin  0.  Gale,  of  Chicago,  111.  . 
40.  It  is  well  known  that  many  pharmaceutical  preparations  deteriorate 
by  keeping.  What  are  the  prominent  instances  of  this  change,  what  are 
the  best  means  of  preventing  or  moderating  them,  and  in  cases  of  partial 
deterioration  of  valuable  medicines,  unfit  for  dispensing,  what  is  the  best 
disposition  to  make  of  them  to  avoid  loss  ? 
Continued  to  Edward  Parrish,  of  Philadelphia. 
Respectfully  submitted  by 
William  Procter,  Jr., 
Frederick  Stearns, 
Committee. 
The  Report  was  accepted  and  directed  to  be  published. 
The  following  resolution,  offered  by  Mr.  Lincoln,  of  Boston, 
was  carried  without  dissent : 
Resolved,  That  the  thanks  of  this  Association  are  due,  and 
are  hereby  presented,  to  the  President,  for  the  dignity  and  im- 
partiality bestowed  by  him  upon  its  deliberations,  and  to  the 
Recording  Secretary  for  his  care  and  application  to  the  increased 
duties  of  his  office. 
