PRECIPITATION  OP  VARIOUS  SALTS,  ETC. 
43 
From  this  the  formula  of  the  body  dried  at  212°  F.  is  calculated 
as  C21  H21  O20.    This  formula  requires — 
C  41-042 
H  6-840 
0  52-118 
Phaseomannite  dissolves  in  cold  concentrated  sulphuric  acid 
without  blackening.  The  solution  only  becomes  brown  when 
heated  to  212g  F.,  deposits  carbon,  and  evolves  sulphurous  acid. 
In  cold  concentrated  nitric  acid  it  dissolves  without  acquisition 
of  color  or  evolution  of  gas ;  on  the  addition  of  English  sulphuric 
acid,  a  body  separates  in  white  flakes.  In  all  probability  this  is 
the  nitro-compound  of  phaseomannite. 
Boiled  with  dilute  sulphuric  acid,  it  appears  to  undergo  no 
alteration,  and  afterwards  produces  no  protoxide  of  copper  on 
the  addition  of  sulphate  of  copper  and  potash.  When  heated 
with  nitric  acid,  it  forms  oxalic  acid. 
Phaseomannite  has  a  pretty  strong  gurgling  action,  which  ex- 
plains the  production  of  looseness  in  the  bowels  by  the  use  of 
beans. 
The  author  observed  that  the  beans  contained  this  body  in  the 
greatest  abundance  when  the  seeds  were  still  small,  and  that  the 
phaseomannite  disappeared  as  starch  was  formed.-— Chem.  Graz, 
from  Liebig's  Annalen,  July,  1856. 
NOTE  ON  THE  PRECIPITATION  OF  VARIOUS  SALTS  FROM 
THEIR  SOLUTIONS. 
By  F.  Margueritte. 
When  muriatic  acid  is  mixed  with  a  solution  of  chloride  of 
sodium,  the  latter  is  immediately,  if  not  completely  precipitated. 
But  if  a  current  of  muriatic  acid  gas  is  passed  until  rejection 
into  a  solution  of  common  salt,  the  latter  is  precipitated  within 
a  few  thousandths,  and  the  liquid  muriatic  acid  left  in  the  fluid 
is  in  such  a  state  of  purity  that  it  may  be  sold. 
With  a  mixed  solution  of  the  chlorides  of  sodium  and  potassium, 
the  chloride  of  sodium  is  first  precipitated,  so  that  by  dividing 
the  operation  the  separation  of  these  two  salts  may  be  effected  in 
a  certain  degree.  The  insolubility  of  the  chlorides  of  sodium  and 
potassium  in  muriatic  acid  is  so  great,  that  under  its  influence 
