Ajn.  Jour.  Pharm. 
Aug.,  1880. 
Arizona  Shellac. 
409 
or  twenty-four  hours,  when,  upon  cooling,  the  camphoric  acid  will  be 
found  floating  on  the  top  of  the  acid  as  a  crystalline  cake.  This  is 
removed  and  carefully  washed  with  ice-cold  water,  when  it  will  be 
found  to  consist  of  a  mass  of  acicular  snow-white  crystals. 
Camphorate  of  Ammonia, — This  salt  is  easily  produced  by  neutraliz- 
ing camphoric  acid  with  liq.  ammonia  fortior,  evaporating  by  a  very 
moderate  heat  until  reduced  to  a  syrupy  liquid,  and  a  pelicle  begins  to 
form,  when.it  is  set  aside  in  a  cool  place  to  crystaUize.  It  is  a  beau- 
tifully crystalline  salt,  consisting  of  masses  of  crystals-,  radiating  from 
central  points,  arranged  in  the  most  symmetrical  manner. 
It  is  a  salt  that  has  sedative  properties  resembling  the  monobromide 
of  camphor,  but,  unlike  that  compound,  it  is  freely  soluble  in  water. 
The  dose  is  from  5  to  10  grains. 
Elixir  Protochloride  of  /r^;/.  —  Rabuteau's  elixir  having  obtained  consid- 
erable celebrity,  I  have  made  a  substitute  bv  the  following  formula  : 
Take  of  Protochloride  of  iron,  .  .  .3  drs.  12  grs. 
Glycerin,  ,  .  .  4  fl.  ozs. 
White  curacoa,  .  .  .12 
Syrup,      .  .  .  .4 
Water,  .  .       sufficient  to  make  2  pints. 
Mix  an  filter. 
Waterproof  Cement. — A  good  waterproof  cement,  suitable  for  mount- 
ing minerals,  etc.,  and  useful  for  aquariums,  can  be  made  by  the  fol- 
lowing : 
Take  of  Gutta  percha,  in  chips,  .  .  .4  ozs. 
Brushmakers'  pitch,  .  .  .8 
Shellac,      .  .  .  .  .  i 
Melt  in  an  iron  capsule,  on  a  sand-bath,  and  stir  together.  Pour 
out  on  a  wet  slab  and  roll  into  sticks. 
ARIZONA  SHELLAC. 
At  a  recent  meeting  of  the  California  Academy  of  Sciences  Profes- 
sor Stillman  read  a  paper  on  the  gum  and  coloring  matter  found  on  the 
Acacia  Greggii  and  the  Larrea  Mexicana  or  creasote  plant.  The  gum 
which  exudes  from  these  plants  is  very  abundant,  and  is  the  product 
known  to  commerce  as  shellac.  The  same  plants  produce  lac  dye. 
Professor  Stillman  suggested  that  California  might  compete  with  British 
India  in  supplying  this  valuable  product.     Mr.  B.  B.  Redding  said  that 
