ANoveTb'erhiTo2!'}      British  Pharmaceutical  Conference.  573 
Variations  in  the  Occurrence  of  Salicin  and  Salinigrin  tn  Different 
Willow  and  Poplar  Barks.— -H.  A.  D.  Jowett,  D.Sc,  and  C.  E.  Potter, 
B.Sc.,  have  examined  a  large  number  of  willow  and  poplar  barks 
and  present  their  results  in  an  interesting  and  comprehensive  paper. 
In  summing  up  the  results  of  their  investigations  the  writers  say : 
Of  the  thirty-three  samples  of  willow  and  poplar  bark  examined, 
salinigrin  was  only  found  in  one — Salix  discolor,  Muhl.  The  amount 
of  salicin  contained  in  the  bark  of  a  willow  or  a  poplar  depends  not 
only  on  the  species,  but  also  on  the  season  of  the  year  in  which 
it  is  collected,  the  sex  of  the  tree,  and  possibly  other  factors 
Solanum  Dulcamara. — Frederick  Davis  found  the  two  alkaloids, 
solanine  and  solanidine,  the  glucoside  solanein  and  the  bitter  prin- 
ciple dulcamarin  in  fresh  specimens  of  this  plant.  An  examination 
of  commercial  solanine  appears  to  indicate  that  it  is  a  mixture  of 
solanine  and  solanidine. 
Limits  of  Reliability  of  Volumetric  Solutions. — R.  C.  Cowley  and  J. 
P.  Catford  demonstrate  that  measurements  by  burette  may  vary 
0-05  c  c.  This  would  be  equal  to  0.50  of  a  solution  one-tenth  the 
strength.  For  this  reason,  they  suggest  that  processes  that  re- 
quire the  use  of  two  solutions  differing  in  strength  as  1  to  10,  should 
direct  that  the  stronger  solution  be  weighed  so  as  to  insure  greater 
accuracy  in  the  ultimate  results. 
Volumetric  Estimation  of  Lead  Salts. — R.  C.  Cowley  and  J.  P.  Cat- 
ford  recommend  the  direct  tritration  of  precipitated  lead  oxalate,  as 
being  simple  in  operation  and  giving  satisfactory  results. 
Pharmacy  Notes. — R.  Wright  gives  modified  formulas  for 
(1)  Liquor  Bromo  Chloral  Compositus  B.P.C. — 35-  sodium  bro- 
mide, 35-  chloral  hydrate,  6-5  tincture  of  cannabis  indica,  0*02 
hyoscine  hydrobromate,  125-  syrup  of  orange,  30-  mucilage  of  acacia, 
60  liquid  extract  of  liquorice  and  distilled  water  enough  to  make 
500. 
(2)  Camphorated  Oil. — Camphor  in  flower  125-  olive  oil  500- 
Place  the  camphor  in  a  dry  bottle,  heat  the  oil  to  71 0  C.  and  add  to 
the  camphor;  shake  frequently  till  solution  is  effected. 
Alcoholic  Extracts — Wright  suggests  that  an  attempt  be  made  to 
work  out  a  scheme  for  the  standardization  of  those  alcoholic  ex- 
tracts which  admit  of  such  treatment. 
The  Volumetric  Determination  of  Sodium  Phosphate  and  Arsenate. 
— F.  R.  Dudderidge  and  J.  S.  Hill  suggest  a  process  for  the  volu- 
