ON  SOME  PREPARATIONS  OF  THE  U.  S.  PHARMACOPOEIA.  303 
with  like  precautions  to  avoid  arsenic  and  any  traces  of  arsenic 
acid  which  may  have  remained,  become  arseniate  of  soda,  and 
is  washed  away  with  the  washing  water.  The  final  treatment  with 
ammonia  is  intended  to  increase  the  product  as  in  the  formula 
for  the  subcarbonate. 
Cadmii  Sulphas. — In  this  process  advantage  is  taken  of  the 
superior  solvent  power  of  nitric  acid  in  dissolving  this  metal, 
when,  by  means  of  carbonate  of  soda,  it  is  obtained  in  a  form 
easily  washed,  and  very  soluble  in  diluted  sulphuric  acid. 
Calois  Fhosphas  Proecipitata,  is  one  of  the  new  preparations. 
Ceratum  Adipis  The  new  name  for  simple  cerate. 
Ceratum  Extracti  Cantharidis. — This  is  the  formula  of  Mr. 
Win.  K.  Warner,  (see  Amer.  Journ.  Pharm.  vol.  xxxii.  page  11). 
Though  apparently  weaker  than  the  cerate  of  cantharides,  it 
is,  theoretically,  about  the  same  strength  as  the  bulk  and 
weight  of  the  cerate  is  increased  merely  by  the  active  portion  of 
the  extract,  removed  by  the  solvent  action  of  the  fatty  matter. 
Ceratum  Sabince. — This  preparation  is  now  a  cerate  of  the 
ethereal  extract  of  cantharides,  and  it  is  stronger,  a3  the  whole 
activity  of  three  troy  ounces  of  savin  are  in  the  weight  of  12j 
troy  ounces  of  the  cerate,  whilst,  in  the  old  preparation,  only 
two  ounces  of  the  powder  was  contained  in  fourteen  troy 
ounces  of  the  cerate.  It  is  a  much  more  elegant,  though  more 
expensive,  preparation. 
Ceratum  Saponis. — This  cerate,  when  well  made  soap  plaster 
is  used,  is  a  more  eligible  preparation  than  the  old  cerate,  and 
very  much  less  trouble  to  prepare.  It  differs  in  containing  no 
acetate  of  potassa  or  free  subacetate  of  lead,  both  of  which  are 
contained  in  the  old  preparation,  if  made  literally  by  the  recipe. 
Cinehonia  Sulphas. — This  is  a  new  officinal.  The  process  is 
based  upon  that  usually  followed  by  the  manufacturers  who  re- 
gain this  salt  from  the  mother-waters  of  the  sulphate  of  quinia 
process.  One  motive  for  its  introduction  was  to  induce  physi- 
cians to  employ  it  as  a  substitute  for  quinia  as  a  tonic.  There  is 
no  doubt  that  in  very  many  of  the  cases  where  quinia  is  ordered 
this  salt  would  prove  efficient,  and  physicians  would  do  well, 
especially  in  the  numerous  instances  where  the  necessities  of 
