AmMay?i9(£arm'}    Recent  Literature  Relating  to  Pharmacy.  227 
solution  by  heat.  Syrups  thus  prepared  do  not  possess  the  milky 
whiteness  of  the  U.S.P.  preparation,  and  in  point  of  stability  have 
apparently  little  advantage. 
Perhaps  worthy  of  mention  is  syrup  of  almond  as  proposed  by 
Dieterich,  which  contains  5  per  cent,  of  acacia  and  is  prepared  by 
heat.  For  counter  sale  this  formula  is  claimed  to  furnish  a  per- 
manent preparation. 
The  syrup  of  the  United  States  Pharmacopoeia  separates  on 
standing.  To  increase  stability,  a  quantity  of  granulated  acacia 
may  be-  employed  while  preparing  the  emulsion.  Gum  arabic  is 
used  in  preparing  emulsion  of  almonds  and  should  not  be  objec- 
tionable in  the  syrup. 
The  syrup  prepared  by  the  following  formula  does  not  separate 
as  readily  as  the  official  preparation. 
SYRUPUS  AMYGDAI.4. 
Sweet  almond  140  grammes. 
Bitter  almond   40  " 
Acacia,  in  granular  powder  10  " 
Sugar  200  " 
Orange-flower  water  100  c.c. 
Water  300  " 
Syrup,  a  sufficient  quantity  to  make  the  syrup  measure  1,000  c.c. 
Rub  the  almonds,  previously  blanched,  in  a  mortar,  with  the 
acacia  and  100  grammes  of  sugar,  and  50  c.c.  of  water  to  a  smooth 
paste.  Mix  this  well  with  the  orange-flower  water  and  100  c.c.  of 
water  and  strain  with  strong  expression.  To  the  residue  add  150 
c.c.  of  water  and  express  again.  In  the  strained  liquid  dissolve 
the  remainder  of  the  sugar  without  heat  and  add  a  sufficient  quan- 
tity of  syrup  to  make  the  product  measure  1,000  c.c.  Mix 
thoroughly. 
RECENT  LITERATURE  RELATING  TO  PHARMACY. 
CONSTITUENTS  OF  TOBACCO  SMOKE. 
At  a  recent  meeting  of  the  German  Scientists'  Association,  Pro- 
fessor Thorns  read  a  paper  on  tobacco  smoke  (Suddtsck.  Ap.  Zt^  1 899, 
650).  It  is  an  interesting  account  of  a  careful  investigation,  the 
greater  part  being  performed  with  the  smoke  of  artificially  aspirated 
cigars.  Omitting  details,  the  sulphuric  acid  through  which  the 
smoke  passed  contained  nicotine,  ammonia  and  pyridine  ;  to  solution 
