Am.  Jour.  Pharm.  i 
Sept.,  1879.  J 
Chemical  Notes, 
449 
Calculated  Vapor-density.  Experimental  Vapor-density. 
For  Sb203,  ....    99-5  Found  at  i$6o°C.f       .       .  19*60 
For  Sb4Oe       .       .       .      19-90  "       "         .  19  98 
The  formula  of  antimonous  acid  is,  therefore,  Sb4Og,  analogous  to 
arsenous  acid,  As4Og. 
Cuprous  chloride  was  also  determined.  The  authors  had  some  time 
previously  made  a  determination,  which  gave  7*05,  corresponding  to 
the  formula  Cu2Cl2,  but  now  have  repeated  the  determination  at  a  much 
higher  temperature. 
Calculated  Vapor-density.  Experimental  Vapor-density. 
For  Cu2Cl2,         .       .       .    6  84  Found  at  i56o°C,        .       .    6  93 
The  formula  seems,  therefore,  definitely  established  as  Cu2Cl2.  Cad- 
mium bromide  gave  the  following  result : 
Calculated  Vapor-density.  Experimental  Vapor-density. 
For  CdBr2>         .       .       .    9*40  Found  at  923°C,       .       .  9*22 
Found  at  9i4°C,  .       .       .  9*28 
The  authors  promise  shortly  to  make  a  determination  of  the  vapor- 
density  of  Beryllium  chloride,  with  a  view  of  settling  the  question  as 
to  the  atomic  weight  of  Beryllium. — Ber.  der  Chem.  G^.,xii,  pp.  1195, 
1282. 
On  the  behavior  of  Chlorine  at  high  temperature. — Victor  and  Carl 
Meyer  have  just  made  public  some  remarkable  results  obtained  in  the 
application  of  their  method  of  determining  vapor-densities  at  high 
temperatures  to  chlorine.  They  first  tried  oxygen  and  found  that  the 
specific  gravity  of  this  gas  was  constant  at  all  temperatures.  Thus, 
the  specific  gravity  was  found  : 
At  i392°C,       .       i'o6  and  1*04  At  i567°C,       .       1*04  and  no 
Calculated  spacific  gravity  for  02  is  1*105. 
In  applying  the  test  to  chlorine,  however,  the  following  results  were 
obtained  : 
Specific  gravity  at  620°C,  2*42  and  2-46  Specific  gravity  at  8o8°C,  2*21  and  2*19 
Specific  gravity  at  io28°C,  1  85  and  1*89  Specific  gravity  at  i442°C,  1*65  and  i*66 
Specific  gravity  at  i392°C,  i-66  and  167  Specific  gravity  at  1567^.,  1  60  and  1*62 
Calculated  specific  gravity  for  Cl2  is  2  45  Two-thirds  of  this  valve  is  163 
It  appears,  therefore,  that  while  the  molecular  weight  of  chlorine 
remained  71  to  a  little  above  6oo°,  at  a  temperature  of  about  I200°C, 
it  becomes  47*3,  or  two-thirds  the  first  value.  These  results  point 
unmistakably  to  the  composite  character  of  what  we  call  chlorine,  and 
Prof.  Meyer  has  re-called  to  our  attention  the  old  "  murium  "  theory  of 
28 
