o82  A  Study  of  the  Use  of  Mayer's  Reagent  {  Am- Jour-  Phatm 
Dec. 
Name  of  al- 
kaloid. 0.100 
used  iu  each 
experiment. 
Cinchonine 
Cocaine 
Especial 
conditions. 
Colchicine 
(Merck's) 
Colchicine 
Crude  from 
colchicum 
seed) 
Emetine 
Gelsemine 
Sol.  strong- 
ly acid. 
Sol.  neutral 
Sol.  acid 
Sol.  strong 
]y  acid 
Mod.  rea- 
gent No.  1 
sol.  acid 
Mod.  rea- 
gent No.  1 
25  per  cent 
alcohol 
Sol.  neutral 
Sol.  acid 
Sol.  nearly 
neutral 
Mod.  rea 
gent  No.  1 
2  per  cent. 
KI  present 
5  per  cent. 
KI  present 
3  per  cent. 
Kl  present 
4  per  cent 
Kl  present 
5  per  cent. 
KI  present 
Mod.  rea- 
gent No.  2 
20  per  cent, 
alcohol 
present 
20  per  cent, 
glycerin 
present 
Mod.  rea- 
gent No 
Mod.  rea- 
gent No.  1 
Mod.  rea- 
gent No.  2 
Sol.  faintly 
acid 
Sol.  acid 
Sol.  more 
acid 
Sol.  faintly 
acid 
1 : 200 
1:400 
1:400 
1:400 
1:200 
1:400 
1 : 400 
1:400 
1:25 
1  :200 
1 ;  200 
1 : 200 
1 : 800 
1:400 
1  : 400 
1 :600 
1  :600 
1:200 
1:200 
1:400 
1:200 
1 : 300 
1 : 600 
1 : 600 
1:600 
1  :200 
1:400 
1  :400 
1:300 
1  :400 
1:200 
1  : 300 
1  : 400 
1  :600 
1  : 800 
1:2°0 
1 :  400 
1  :6»0 
1:300 
1:300 
1  : 200 
1  :200 
1 :  200 
1  :400 
Mayer's  solution.  1-20  normal. 
Required 
Added, 
Produces 
Required  Excess  at 
to  give 
Kiving 
only  I 
for  com- 
end 
Actually 
apparent 
Large  ex- 
slight 1 
plete  pre- 
of titra- 
consumed 
exces  s . 
cess. 
precipit. 
cipitation. 
tion. 
120 
17-4 
I9'4f 
80 
124 
2-4 
10  0 
10-0 
140 
11 -5 
140* 
70 
84 
71 
94 
0-8 
86 
8-8 
12'4* 
16'Oft 
36 
124 
6-2 
116 
9-0 
72 
9  7 
0-7 
9  0 
106 
11 
95 
121* 
124 
13 '2* 
10-0 
12-8 
34-4 
4-6 
98 
152 
140 
16-0f 
5  2 
10  8 
148 
152 
8- 
9-2 
9*6 
11  2 
l'S 
9-4 
11-2 
12  0 
14-4 
41 
103 
92 
11  -3f 
9'6 
11  2f 
12:8 
14  4  ' 
11-6 
132 
10'8 
12  8 
12-2 
1  6 
10-  6 
14-5 
134 
9-2 
10- 1  to 
11  Of 
2  5 
8-0 
9-2f 
3-2 
92 
■ 
4-0 
9  0 
10-2 
6" 
9-6, 
10-  to  12-f 
5' 
8  6 
;  l*5tol2'5t 
I  4-0 
126 
14-  to  15"}- 
88 
8-0 
8-8 
9  2  to  9  8 
85 
10-O 
102 
10 
<v«> 
9  I 
9-2 
106 
0-6 
10*0 
94 
0-6 
8-8 
ll-2f 
5-8 
9  6 
100 
3-8 
9-8 
104 
102 
108 
80 
9-6 
11-2  to 
1 
12<)t 
