'^"'jiXissT™  }   Analytical  Researches  and  Investigations.  285 
reason  the  author  proposes  the  following  modification  of  Reichardl;'s 
method,  when  it  is  required  to  estimate  the  glycerin  in  wines  contain- 
ing sugar.  100  cubic  centimeters  of  the  wine  are  evaporated  with  a 
little  quartz-sand  upon  the  water-bath  to  dryness.  The  residual  syrup}r 
mass  is  then  successively  extracted  with  absolute  alcohol  (100  to  150 
cubic  centimeters,  according  to  the  amount  of  sugar),  and  the  liquids 
subsequently  mixed  in  a  large  glass  flask.  For  1  part  of  applied  alcohol 
IJ  part  of  ether  is  added,  the  mixture  well  shaken,  and  then  allowed 
to  repose  until  the  liquid  has  become  perfectly  clear.  The  larger  por- 
tion of  the  sugar  will  be  deposited  as  a  syrupy  mass,  while  the  entire 
amount  of  glycerin  will  be  contained  in  the  alcohol-ether  solution. 
The  clear  solution  is  then  poured  off  from  the  deposit  and  the  latter 
again  washed  with  small  amounts  of  a  mixture  of  1  part  of  alcohol 
and  IJ  part  of  ether.  The  combined  solutions  are  then  distilled,  the 
residue  brought  into  a  porcelain  dish  with  the  aid  of  a  little  water,, 
and  further  treated  as  in  the  case  of  an  evaporated  wine  containing  no 
sugar,  according  to  the  usual  method. — Zeitsch.  fur  Analyt.  Chemiey. 
1882,  xxi,  p.  239. 
Purification  of  Carbon  Bisulphide, — P.  Palmieri  recommends,  after 
removing  the  aqueous  layer  with  which  commercial  carbon  bisulphide 
is  usually  covered,  to  add  to  every  100  parts  of  the  latter  from  2  to  3 
parts  of  anhydrous  cupric  sulphate,  and  subsequently  well  agitating 
the  mixture.  When  the  cupric  sulphate,  which  becomes  perfectly 
black,  is  deposited  and  the  odor  of  sulphuretted  hydrogen  is  no  longer 
perceptible,  the  liquid  is  filtered  or  decanted.  Absolute  purity  is 
obtained  when  the  carbon  bisulphide  is  again  rectified  over  anhydrous 
cupric  sulphate.  In  order  to  maintain  the  carbon  bisulphide,  which 
in  this  manner  is  said  to  lose  all  disagreeable  odor,  permanently  pure^ 
it  may  be  allowed  to  remain  in  contact  with  a  little  anhydrous  cupric 
sulphate.  The  employed  cupric  sulphate  may  be  made  available  for 
further  use  in  purification  by  ignition,  treatnient  with  sulphuric  acid,, 
and  subsequently  again  igniting.  E.  Allary  [Bull,  de  la  aS'oc.  Chim., 
35,  p.  492)  covers  the  carbon  bisulphide  to  be  purified  with  an  aqueous 
layer,  and  then  adds  gradually,  with  active  agitation,  a  solution  of 
potassium  permanganate  until  the  aqueous  layer  remains  permjuiently 
red.  The  product  is  then  washed  with  water,  and  finally  se])arated  in 
a  separatory  funnel.  In  most  cases  a  further  })urification  by  i-ectifica- 
tion  is  not  necessary. — Ibid.,  p.  255. 
TJie  Detection  of  Watei-  in  Alcoliol  and,  Ether. — Ac(;ording  to  the 
