VARIETIES. 
367 
Juniper  Tar  Soap. — "This  soap  is  made  by  distillation  from  the  tar  of  the 
wood  of  the  Juniperis  communis,  by  dissolving  this  spirit  in  a  fixed  vegeta- 
ble oil,  as  that  obtained  by  expression  from  almonds  or  olives,  and  forming 
a  soap  by  means  of  a  weak  soda-lye,  after  the  customary  manner.  This 
yields  a  moderately  firm  and  clear  soap,  which  may  be  readily  used  by  ap- 
plication to  parts  affected  with  eruptions  at  night,  mixed  with  a  little  water, 
and  carefully  washed  off  the  following  morning.  This  soap  has  lately  been 
much  used  for  eruptive  disorders,  particularly  on  the  Continent,  and  witli 
various  degrees  of  success.  It  is  thought  that  the  efficient  element  in  its 
composition  is  rather  less  impure  hydrocarburet  than  that  known  in  Paris 
under  the  name  huile  de  cade.  On  account  of  its  ready  miscibility  with 
water,  it  possesses  great  advantage  over  the  common  tar  ointment. — Annals 
of  Pharmacy. 
Chemical  examination  of  Naples  Soap. — A.  Faiszt  has  submitted  this 
celebrated  shaving  soap  to  analysis.  He  states  that  it  is  made  by  saponi- 
fying mutton  fat  with  lime,  and  then  separating  the  fatty  acids  from  the 
soap  thus  formed,  by  means  of  a  mineral  acid.  These  fatty  acids  are  after- 
wards combined  with  ordinary  caustic  potash  to  produce  the  Naples  soap. 
He  found  that  100  parts  of  this  soap  contained 
Parts. 
Fatty  acids,        ....  57.14 
Potash  combined  with  the  fatty  acids,    .  10.39 
Sulphate  of  potash,  chloride  of  potassium, 
with  a  trace  of  carbonate  of  potash,    .  4.22 
Silica,  &c  0.46 
Water,  2T.68 
Annals  of  Phar.}  from  Geicerbeblatt  aus  Wurttemberg. 
A  Purple-red  Ink  for  marking  Linen. — The  place  where  the  linen  is  to 
be  marked  is  first  wetted  with  a  solution  consisting  of  three  drachms  of 
carbonate  of  soda,  and  three  drachms  of  gum  arabic,  dissolved  in  an  ounce 
and  a  half  of  water,  then  dried  and  smoothed.  The  place  is  now  to  be 
written  on  with  a  solution  composed  of  one  drachm  of  chloride  of  platina 
dissolved  in  two  ounces  of  distilled  water,  then  allowed  to  dry.  When 
quite  dry,  the  writing  is  to  be  painted  over  with  a  goose's  feather,  moistened 
with  a  liquid  consisting  of  one  drachm  of  protochloride  of  tin  dissolved  in 
two  ounces  of  distilled  water. — Annals  of  Phar.,  from  Bottger's  Polyt. 
Noiizblatt. 
Hyposulphite  of  Soda  and  Silver. — This  compound  substance  has  lately 
been  recommended  as  a  remedial  agent,  by  Dr.  J.  Delioux,  of  Cherbourg. 
It  is  prepared  by  pouring  upon  oxide  of  silver,  recently  precipitated  by  po- 
tassa,  a  solution  of  hyposulphite  of  soda,  until  it  is  completely  dissolved. 
After  evaporation  of  this  mixture,  crystals  of  hyposulphite  of  soda  and 
silver  remain.    This  compound  salt  has  the  appearance  of  a  greyish-white 
