56o  U.  S.  Pharmacopoeial  Revision.        { iSgusri9''2'3. 
be  filtered  out.  The  percentage  which  is  used  could  easily  be  checked 
by  an  evaporation  test.  Samples  preserved  in  this  way  under  the 
most  trying  conditions  have  kept  for  more  than  ten  years.  The 
same  oil  unpreserved  became  turpentine-like  in  a  short  time. 
Phenol  Liquef actum. — Add  the  following  note  to  the  official  text : 
When  phenol  is  to  be  mixed  with  collodium,  fixed  oils,  or  petro- 
latum, use  melted  crystalline  phenol  instead  of  liquefied  phenol. 
Spiritus  Aetheris  Nitrosi. — ^The  manufacturing  process  of  the 
v.  S.  P.  for  spirit  of  nitrous  ether  should  be  omitted.  There  should 
be  included  in  the  U.  S.  P.  a  standard  for  ethyl  nitrite  as  now  sold. 
The  spirit  of  nitrous  ether  of  the  U.  S.  P.  should  then  be  directed 
to  be  made  from  definite  weights  of  this  standard  ethyl  nitrite  and 
of  alcohol. 
Syrupus  Aurautic. — It  is  recommended  that  the  talc  be  omitted 
and  the  following  formula  used: 
Tincture  of  Sweet  Orange  Peel   50  Mils 
Citric  Acid   5  Gms. 
Glycerin   100  Mils 
3yrup,  sufficient  to  make   1000  Mils 
Mix  the  tincture  with  the  glycerin  and  then  add  the  syrup  in 
whicn  the  acid  has  been  dissolved.  The  syrup  is  not  entirely  clear 
but  its  flavor  is  superior  to  that  prepared  by  the  U.  S.  P.  IX  method. 
Syrupus  Hypophosphitum. — Direct  the  calcium  hypophosphite 
to  be  dissolved  in  the  water  with  the  aid  of  the  hypophosphorous 
acid  as  the  first  step  in  the  making  of  the  syrup;  otherwise  there  is 
often  difficulty  experienced  in  obtaining  its  solution. 
Syrupus  Ipecacuanhae. — ^Acetic  acid  should  be  omitted  from  the 
formula,  as  hydrochloric  acid  is  used  in  the  fluidextract  when  made 
according  to  the  Pharmacopoeia  formula. 
Syrupus  Lactucarii. — ^We  recommend  the  process  for  this  syrup 
suggested  by  Beringer  (This  Journai,,  p.  315,  1909),  as  follows: 
Las  ucarium   50  Gms. 
Glycerin   250  Mils 
Sugar   600  Gms. 
Stronger  Orange  Flower  Water   100  Mils 
Distilled  Water,  sufficient  to  make   1000  Mils 
Mix  the  lactucarium  with  400  Gms.  of  clean  sand  by  thorough 
trituration.  Place  the  mixture  in  a  percolator,  and  without  packing, 
pour  on  sufficient  of  a  mixture  of  the  glycerin,  orange  flower  water, 
