ON  PARAFFIN. 
531 
stituted  by  either  potassa  or  ammonia,  and  chloride  of  sodium 
cannot  replace  the  fluoride ;  but  a  double  salt  may  bo  obtained 
of  the  formula  3NaO,  As06  +  NaF  +  24HO,  which  is  isomor- 
phous  with  the  above  J.  M.  Maisch. 
Ann,  d.  Chem.  §  Pharm.,  Jan.  1856. 
ON  PARAFFIN. 
By  Frans.  Filipuzzi. 
Professor  Redtenbacher  had  received  from  Messrs.  White,  Young 
&  Co.,  in  Glasgow,  a  sort  of  paraffin,  prepared  from  a  bituminous 
slate  ;  it  was  analysed  by  the  author. 
The  paraffin  was  white,  crystalline,  of  a  fatty  lustre,  devoid  of 
taste  and  smell;  spec.  grav.  0.861  at  15°C,  melting  point  55°C. 
It  was  wholly  dissolved  by  boiling  alcohol,  separating  on  cooling 
in  crystalline  masses,  which,  under  the  microscope,  showed  three 
different  shapes  :  felt-like  needles,  angular  grains,  and  scales  with 
mother  of  pearl  lustre.  From  the  concentrated  mother  liquor 
only,  the  last  mentioned  scales  separated,  which,  on  repeatedly 
dissolving  and  separating  them,  did  not  alter  their  appearance  or 
their  melting  point,  which  was  at  45°C. 
The  first  mixed  crystalline  mass  was  dissolved  in  alcohol ;  on 
cooling,  pearly  scales  of  48° C.  melting  point  were  obtained  ;  on 
farther  evaporation,  the  needles  intermixed  with  those  angular 
grains  were  gained,  which  could  not  be  separated.  By  manipu- 
lating in  this  way,  nine  different  specimens  were  obtained,  each 
varying  in  the  melting  point  as  follows  : 
1*2        3         45  6        7  89 
45°     48°     499      49.5°    51°     56.5°    57°     57.5  58°C. 
The  elementary  analysis  of  some  of  these  specimens  show  them 
to  be  composed  of  isomorphous  or  polymorphous  carburetted 
hydrogen.    The  results  are — . 
45°         49.5        56.5°       57.5°        58°  melt.pt.. 
C  85.47       85.53       85.72       85.77  85.69 
H         14.29       14.23       14.31       14.21  14.29 
By  treating  it  with  concentrated  nitric  acid  for  several  days? , 
paraffin  was  entirely  dissolved,  and  the  solution  on  diluting  with 
water  was  scarcely  rendered  turbid.    On  distilling,  a  volatile  fat 
