410         ON  THE  PREPARATION  OF  DEUTOXIDE  OF  LEAD. 
lated  by  HC1 ;  solution  precipitated  by  ammonia ;  precip.  was 
redissolved  and  reprecipitated.  An  accident  contaminated  the 
result  with  phosphate  of  lime,  and  the  presence  of  other  en- 
gagements precludes  the  idea  of  a  further  examination  of  the 
mixture. 
The  results  of  my  labor,  a  portion  only  here  stated,  are  meagre 
and  unsatisfactory  ;  they  are  sufficient,  however,  to  inspire  the 
hope  that  my  future  investigations  may  develope  facts  interesting, 
and  I  hope  also  useful  in  their  character,  from  the  refuse  matters 
of  the  Gossypium  Herbaceum. 
ON  THE  PREPARATION  OF  DEUTOXIDE  OF  LEAD. 
By  Ferd.  Feist  Mayer. 
To  the  Editor  of  the  American  Journal  of  Pharmacy  : 
Dear  Sir, — The  process  given  by  Prof.  Woehler,  and  men- 
tioned in  the  last  number  of  your  Journal,  produces  a  perfectly 
pure  deutoxide  of  lead,  and  is  certainly  a  very  expeditious 
method  for  those  to  which  the  disengagement  of  gaseous  chlorine 
is  not  combined  with  any  inconveniences. 
As  this  is,  however,  very  often  the  case,  you  will  allow  me  to 
mention  a  different  way  which  I  have  followed  in  preparing 
larger  quantities  of  the  deutoxide,  and  which  yields  as  much 
and  at  least  as  cheap  a  product  as  Woehler's. 
In  the  latter,  the  action  of  chlorine  on  the  protoxide  of  lead 
is  mediated  by  the  formation  of  hypochlorite  of  soda  and  chlo- 
ride of  sodium. 
PbO  A+ NaO  C02  (+Cl)=PbO  C02-]-NaO  A  (+C1)= 
PbO  COa+J  NaO  ClO+i  NaCl  (+A)=Pb02+NaCl  +  C02+A. 
An  alkaline  solution  of  a  hypochlorite,  as,  for  instance,  that 
formed  by  decomposing  chloride  of  lime  with  sulphate  of  soda 
and  an  excess  of  carbonate  of  soda,  or  the  officinal  Labarraque's 
solution,  will  therefore  act  precisely  in  the  same  manner  on  any 
compound  of  oxide  of  lead.  Of  the  latter,  even  for  analytical 
purposes,  the  brown  acetate  and  the  sulphate  of  lead  furnish  the 
same  products  as  the  more  costly  salts. 
I  decompose  the  chloride  of  lime  as  given  in  the  U.  S.  Phar- 
macopoeia under  liquor  sodse  chlorinatae,  and  pour  the  decanted 
