A\3ovr,'^Xm'}  Variation  of  Strength  in  Opium  Preparations.  497 
In  the  next  table  I  give  the  estimation  of  several  samples  of  Extrac- 
tion Opii. 
Water  per  cent. 
!M[orpriia.  per  cent. 
Morphia  per  cent> 
No. 
1 
19*2 
19-4 
No 
7 
22-8 
No. 
2 
2  I  "2 
197 
No. 
8 
No. 
3 
26-8 
16-2 
No. 
9 
20-5 
No. 
4 
l8'4 
19*6 
No. 
1 0 
15*4 
No. 
5 
23*2 
19  7 
No. 
1 1 
20'4 
No. 
6 
22*0 
l8'2 
The  difference  between  the  maximum  22'8  and  the  minimum  15*4 
is  equal  to  a  variation  in  the  morphia-strength  of  about  3  to  4J.  The 
average  percentage  is  19*7. 
I  next  give  a  list  of  the  samples  of  Extractum  Opii  Liquidum  exam- 
ined, with  their  specific  gravities  and  the  amount  of  morphia  in  the 
fluidounce. 
No. 
Spec.  Grav. 
Grs.  Morphia  in  fl.  oz. 
No. 
Spec.  Grav. 
Grs.  Morphia  in  fl.  oz 
I. 
II. 
mean 
I 
II. 
mean 
1 
0-987 
3-82 
4-08 
3-95 
9 
0-985 
4-68 
4  34 
451 
2 
0-992 
4'02 
3"95 
3*98 
10 
i  -ooo 
4-17 
4-01 
409 
3 
0  986 
2-66 
2-87 
2-76 
1 1 
0-989 
3-68 
375 
376 
4 
0993 
3*o4 
3-89 
3'46 
12 
37i 
5 
0-996 
373 
3-12 
3'42 
*3 
2-28 
6 
0-995 
2*26 
2*o6 
2-16 
14 
o-6i 
7 
0-992 
r78 
i-63 
i-66 
15 
2'22 
8 
0-996 
4'33 
2'34 
4'33 
It  will  be  observed  that  in  these  fifteen  samples  the  grains  of  mor- 
phia in  the  fluidounce  varied  from  o*6  to  4*5,  the  average  being  3*12, 
Only  one  estimation  of  the  last  four  was  made,  as  these  were  exam- 
ined some  months  ago,  without  any  intention  of  publishing  the  results. 
In  one  or  two  cases  it  would  have  been  advisable  to  repeat  the  deter- 
mination of  the  morphia,  but  the  quantity  of  each  sample  admitted  of 
only  two  estimations  being  made. 
In  the  following  table  I  give  the  assays  of  eighteen  samples  of  the 
Tinctura  Opii,  with  thsir  specific  gravities. 
