MANNITE  WITH  ALKALINE  SOLUTION  OF  COPPER.  31^ 
to  emerald  green,  which,  in  dilution  with  water,  forms  greenish 
resinous  flocks. 
Heated  to  212°  F.  it  softens  and  becomes  elastic ;  heated  on 
platina  foil  it  fuses  without  coloring  and  evaporates  in  white 
vapor,  partially  decomposed  leaving  no  traces. 
M.  Lebaigne,  of  the  analytical  laboratory  of  the  Pharmacie 
Central  de  Paris,  in  a  mean  of  two  analyses  obtained  C51'33, 
H6-85,  041-82=  to  C^^H^^O^^ 
The  ineft  crystalline  substance  is  neuter  and  contains  no 
nitrogen.  It  is  insoluble  in  chloroform  and  ether  free  from  al- 
cohol, but  soluble  in  alcohol,  especially  hot ;  water  dissolves  it 
but  slightly.  Sulphuric  acid  is  colored  purplish  red  ;  nitric  and 
muriatic  acid  are  not  colored,  and  when  heated  it  fuses  and  is 
consumed  without  residue. — Jour,  de  Pharm.^  Avril,  1869. 
ON  THE  BEHAVIOUR  OF  MANNITE  TO  ALKALINE  SOLUTION 
OF  COPPER. 
By  C.  Scheibler. 
If  caustic  lime  and  precipitated  oxide  of  copper  are  added  to 
solution  of  mannite,  both  oxides  are  dissolved  in  different  pro- 
portion;  this  solution  kept  at  a  temperature  of  60  to  70°C. 
separates  cuprous  oxide.  In  the  presence  of  sufficient  quantities 
of  lime  and  cupric  oxide  and  under  the  same  external  condi- 
tions, the  reduction  continued  for  several  months  without  be- 
coming finished. 
The  liquid  filtered  from  the  cuprous  oxide  had  a  blue  color 
from  dissolved  cupric  oxide,  which  was  removed,  together  with 
the  lime,  by  carbonic  acid.  The  filtrate  contained,  besides  un- 
^altered  mannite,  the  lime  salt  of  the  acid  formed  by  the  decom- 
position of  the  former.  Neutral  acetate  of  lead  was  without 
action  ;  but  the  basic  salt  produced  a  precipitate  soluble  in  an 
excess  of  the  reagent.  The  white  lead  salt  was  well  washed, 
decomposed  by  sulphuretted  hydrogen,  and  the  filtrate  evapora- 
ted on  the  water-bath. 
The  acid  thus  obtained  is  a  colored  syrup,  remaining  liquid  even 
over  sulphuric  acid.  It  decomposes  energetically  the  alkaline 
carbonates,  reduces,  when  heated,  ammoniacal  solution  of  silver, 
