A'm'DrSarm'}  -4  Study  of  the  Use  of  Mayer's  Reagent. 
583 
Same  of  al- 
kaloid. 0.100 
used  in  each 
experiment. 
Hydrastine 
Hyoscya- 
mine 
(Merck's 
eryst.) 
Morphine 
Pilocarpine 
Quebracho 
alkaloids 
Quinine 
Especial 
conditions. 
Mayer's  solution,  1-20  Normal. 
1  :  100 
1  :200 
1:300 
1:400 
1  : 600 
1  : 200 
Mod.  rea-  ;    1  :200 
gent  No.  1 
Sol.  neutral] 
Sol.  acid  I 
Sol.  neutral! 
Mod.  rea- 
gent  No.  l! 
1  :200 
1  : 200 
1:400 
1  : 200 
Strychnine 
Titrated 
without  fil- 
tration 
Mod.  rea-  j 
gent  No.  1] 
Sol.  Slightly; 
acid 
Sol.  more 
acid.  i 
Sol.  slightly! 
acid.  i 
Sol.  neutrals 
acid  i 
Mod.  reag't.i 
No.lneutralj 
Mod.reag't. 
No.  1  acid 
Mod.  reag't. 
No.  1  strong-; 
ly  acid  j 
Mod.  re  g't.j 
No.  l,25perj 
cent,  alco- ! 
hol.f  j 
Sol.  neutral 
Sol.  acid 
"  more  " 
"  neutral 
"  acid! 
"  more  "  1 
Mod.  reag't.i 
Mod.  reag"t.i 
No.  1  acid  j 
1  : 200 
1  :200 
1:  200 
1:200 
1  :200 
1:200 
1:400 
1:400 
1:600 
1:200 
1  :4<i0 
1 :400 
1:  400 
1 :4U0 
1  :400 
1:400 
1:200 
1  :200 
1  :200 
1  :400 
1  :400 
1 :  400 
1  :200 
1  :400 
1  :400 
Bequired 
to  give  • 
apparent 
excess. 
Added,  ] 
giving 
large 
excess. 
Produces  1 
only 
slight 
precipit. 
Required 
for  com- 
plete pre- 
cipitation. 
Excess  at 
end 
of  titra- 
tion. 
Actually 
consumed. 
.  
• 
•  7-2 
74 
7-8 
8  2 
8'4 
92 
6-8 
83 
S.5  to  9  If 
67 
6*6 
7-8 
70 
86 
6-9 
9-lt 
8  8 
06 
8-2 
j  4-8 
188 
194 
23 
171 
ID  I  JJ 
21'4t 
14 
20-0 
9- 
140 
1.52 
1-6 
136 
13  6 
143tt 
14 
12*9 
8  -2  to  8'6 
96 
10-4 
10 
94 
112 
|  8-8. 
14  0 
155 
27 
128 
128 
16-8 
j  11-6 
151 
160 
34 
12  6 
16-0 
•8-  to  19-f 
j  12-0 
10  5 
12*5 
i  12-6 
13  on 
13-ft 
- 
19  ^ 
1  9-5 
12-4tt 
11-2 
122 
140 
no 
0-6 
104 
110 
;  n-4 
11-8 
03 
115 
•     11-4  ff 
12-0* 
11 .6t 
i  11-4 
12  0tf 
12-8 
10-4 
116 
112 
11-6 
13-6 
i  11-2 
1 
1 
12-0 
j 
1  .  i 
■f  End  of  reaction  not  well  defined. 
ft  Modified  reagent  No.  1. 
|  Precipitate  forms  distinct  crystals. 
*  Precipitate  forms  and  redissolves,  more  reagent  again  producing  precipitate. 
OBSERVATIONS. 
Aeonitine. — Titrations  give  pretty  uniform  results.  The  end  of 
the  reaction  is  generally  quite  sharply  denned,  and  dilution  has  less 
influence  than  in  the  case  of  most  alkaloids.    For  fluid  extracts  and 
