240 
Impurity  in  Chloroform. 
Am.  Jour.  Pharm. 
May,  1892. 
answer  all  the  P.  B.  tests,  were  treated  in  the  manner"  just  described, 
and  gave  the  following  results : 
No. 
I. 
2. 
3- 
4- 
5- 
6. 
7- 
io  p.  c.  fraction. 
No  bad  smell 
table  I. 
15  p.  c.  residue. 
No  bad  smell. 
Residue  at  80-900  F. 
Parts  by  weight. 
pt.  in  1,946,100 
487,500 
487,500 
487,500 
390,000 
121,875 
243,750 
It  is  evident  from  these  results  that  the  P.  B.  tests  permit  a  prep- 
aration containing  sixteen  times  more  impurity  than  is  found  in  one, 
and  four  times  more  than  we  obtain  from  others,  to  pass  into  the 
market  and  take  its  place  there  on  an  equality  with  them.  They 
also — and  I  consider  this  a  very  important  point — supply  material 
which  proves  that  chloroform  of  equal  purity  can  be,  and  is  pre- 
pared from  other  substances  than  duty  paid  alcohol,  for  the  second, 
third,  and  fourth  samples  were  prepared — not  specially,  but  in  the 
ordinary  course  of  manufacture — from  alcohol,  acetone,  and  methy- 
lated spirit,  and  are  found  to  be  practically  identical. 
Six  other  samples,  some  said  to  be  of  P.  B.  purity,  and  others 
laying  claim  to  chemical  purity,  were  subjected  to  the  same  treat- 
ment as  the  preceding  seven,  and  gave  results  as  under : 
10  p.  c.  fraction. 
Bad  smell 
«  c< 
Very  bad  smell 
Slight  " 
TABLE  II. 
15  p.  c.  residue, 
very  bad  smell 
no  bad  smell 
very  bad  smell 
bad  smell 
Residue  at  80-900  F. 
Parts  by  weight. 
i  part  in  57,352 
1  "  324,999 
1  "  243,750 
1      "  121,875 
1  "  324,999 
1     "  390,000 
None  of  the  above  samples  in  their  original  form  were  found  to 
answer  the  P.  B.  tests,  but  the  ordinary  consumer  would  pass  the 
bulk  of  them  as  of  P.  B.  purity ;  he  could  not  fail,  however,  to 
detect  the  bad  smell  either  in  the  residue  or  the  io  per  cent,  fraction, 
which  points,  I  think,  to  the  absolute  necessity  for  some  more  exact- 
ing test  being  provided. 
This  process,  which  may  be  considered  an  extension  of  the  pres- 
ent bad  smell  and  residue  tests  of  the  P.  B.,  requires  about  130  cc. 
