396 
Chemical  Notes. 
(  Am.  Jour.  Pharm. 
\      Aug.,  1879. 
respectively  1  or  2  drops  of  the  oils.  Genuine  oil  of  rose  retains  its 
color,  while  the  other  two  turn  brown,  the  geranium  oil  acquiring  the 
most  intense  coloration.  Copper  filings  moistened  with  nitric  acid, 
used  instead  of  the  iodine,  soon  causes  the  bell-glass  to  be  filled  with  red 
fumes,  which  are  absorbed  by  the  oils,  and  render  oil  of  geranium 
apple  green,  while  ros£  oil  and  oil  of  rose  become  dark-yellow,  the  for- 
mer more  rapidly  than  the  latter.  If  one  or  two  drops  of  these  oils  are 
mixed  with  an  equal  amount  of  concentrated  sulphuric  acid  they  turn 
brown,  the  oil  of  rose  retaining  its  pleasant  odor,  while  the  geranium 
joil  acquires  a  strong  and  offensive,  and  the  ros£  oil  a  strong,  fatty  odor. 
CHEMICAL  NOTES. 
By  Prof.  Saml.  P.  Sadtler. 
Inorganic  Chemistry.— Preparation  and  Analysis  of  Potassium  Ultra- 
marine.— With  the  aid  of  the  silver  ultramarine,  prepared  by  Heu- 
mann,  a  great  number  of  other  ultramarines  can  be  gotten,  because  of 
the  affinity  possessed  by  silver  for  the  halogens  with  which  the  other 
metals  may  be  combined  as  chlorides.  Thus,  on  heating  the  yellow 
silver  ultramarine  with  an  excess  of  powdered  potassium  chloride,  bro- 
mide or  iodide  in  a  porcelain  crucible,  the  fused  mass  turns  blueish- 
green,  and  after  washing  out  the  silver  chloride,  bromide  or  iodide  with 
ammonia,  or  dilute  potassium  cyanide  solution,  the  potassium  ultrama- 
rine remains  as  a  beautiful  lasure-blue  powder.  The  ultramarine,  pre- 
pared by  the  aid  of  potassium  iodide,  appears  to  be  the  finest  in  color. 
An  analysis  showed  the  following  composition  in  the  pure  material  : 
Potassium,           ....  *5'I9 
Aluminum,    .....  13*84 
Sulphur,  .....  7-14 
Silicon,          .....  15*40 
Oxygen  (difference),       .           .           .  38*43 
The  direct  preparation  of  a  potassium  ultramarine,  after  the  methods 
used  in  the  sodium  ultramarine  manufacture,  does  not  appear  ever  to 
have  succeeded. — Ber.,  xii,  p.  784. 
On  the  Sulphides  of  Phosphorus. — G.  Ramme  has  heated  mixtures  of 
sulphur  and  phosphorus,  dissolved  in  carbon  disulphide  and  placed  in 
sealed  glass  tubes.    He  obtained,  in  this  way,  pale-yellow  groups  of 
