Am.  Jour.  Pharm.  ) 
October,  1909.  j 
Headache  Mixtures. 
483 
washings  to  a  tared  beaker  or  dish  precisely  as  in  the  case  of  caffein. 
Allow  the  solvent  to  evaporate  spontaneously  or  by  means  of  a  blast 
RESULTS    OBTAINED    IN    THE   CO-OPERATIVE    WORK    ON    AN    ACETANILID  MIXTURE. 
Analyst. 
L.  A.  Brown,  North  Dakota. 
L.  D.  Havenhill,  Kansas. 
H.  L. 
H.  A. 
T.  F. 
E.  L. 
E.  M. 
C.  B. 
A.  R. 
G.  E. 
W.  O. 
Schulz,  Michigan. 
Seil,  New  York.  . 
Darling,  New  York. 
Redfern,  Nebraska. 
Bailey,  s  Connecticut .  .  . 
Morrison,  5  Connecticut 
Mehrtens,  California  
Colby,  California  
Emerv,  Washington,  D.  C. 
Average 
Maximum. 
Minimum  . 
Difference . 
Acetanilid. 
Soda 
bicarbonate. 
Caffein 
Total.* 
Volu-  1  Gravi-  |  Volu-  Gravi- 
metric, metric,  metric,  metric. 
P.  ct. 
12.16 
10.93 
11.05 
10.  40 
11.  50 
10.73 
I0.55 
10.49 
10.  48 
10.  62 
9.80 
10.06 
9-93 
10.20 
10.90 
11 . 17 
11.30 
1137 
10.  67 
10.30 
10. 00 
10.23 
10.  29 
10.  01 
P.  ct. 
65-93 
66. 10 
65-93 
66. 10 
63.00 
61.50 
63.40 
63-44 
63.00 
62 . 00 
65-78 
65.80 
P.  ct. 
65.10 
64.58 
63.03 
63.21 
64-53 
64 . 00 
65.  26 
67.72 
63 .  60 
63.80 
64.80 
64-  53 
65-  33 
64.79 
64.85 
10.71  64.38 
12.16 
9.80 
2.36 
Known  composition  of  acetanilid 
mixture  (acetanilid,  453  parts; 
caffein  (anhyd.),  70  parts;  soda 
bicarbonate,  174  parts)  
66. 10 
61.50 
64.68 
65.01 
67 .  72 
63.60 
P.  ct.     P.  ct. 
23.20   
  23-5o 
 I  23.20 
25-93 
25.67 
25-93 
; 25.IO 
25.OO 
j  24.90 
j  25.00 
i  24. 60 
24.  80 
; 25-03 
25.11 
25.13 
25-13 
25.06 
24-93 
25. 00 
24.93 
25.07 
24-  54 
25-  57 
25-33 
25-43 
24.99 
24.79 
24.92 
24-95 
25.01 
P.  ct. 
101.29 
100. 53 
100. 18 
99.  60 
97-23 
99.63 
99-97 
98.60 
97.80 
101.36 
100. 86 
101 .41 
103.47 
99.96 
99-57 
98.25 
98.64 
100. 50 
99.71 
1  o  1 . 1 5 
99.82 
100. 12 
99-94 
100. 09 
99.7o 
25.18  24.89  99 
25-93|  25-57 
23.201  23.20 
103.47 
97-23 
4.6o|    4.12:    2.731  2.37 
6.  24 
10.  04 
64.99 
24.96 
99.99 
5  Reported  by  J.  P.  Street. 
6  In  cases  where  two  percentages  for  volumetric  and  gravimetric  deter- 
minations of  the  same  substance  were  reported,  the  mean  of  such  percent- 
ages has  been  taken  in  computing  the  total  percentage. 
