802 
Proceedings of the Royal Society 
the heavy metals, the experiment in some cases is not so successful, 
so that it is always better to boil with Na 2 C0 3 or K 2 C0 3 , so as to 
expel the heavy metals, and get the acid radicles in combination 
with sodium or potassium. 
The following results of carefully worked experiments, out of 
many more, I give in detail, to show the trustworthiness of the 
method : — 
Ingredients 
in the 
Mixture. 
Weight of 
each Salt in 
the Mixture. 
Observations. 
Remarks. 
i 
O'OOl grin. 
Red colour in bulb, violet vapour, 
starch coloured blue. 
Br 
1-000 „ 
Strong and thick Br vapours, starch 
coloured yellow, ether red. 
Cl 
o 
o 
1 — 1 
o 
Smell of chlorine, and white pp. of 
AgCl. 
I 
0 001 „ 
Red colour in bulb, violet vapour, 
starch coloured blue. 
Br 
o-oio „ 
Smell of Br strong, ether coloured red. 
Cl 
1-000 „ 
Strong smell of chlorine,* and white 
* The Cl came off 
pp. of AgCl. 
latterly with the 
bromine. 
I 
r i 
o-ioo „ 
All the iodine reactions. 
J 
1 Br 
o-ooi „ 
Smell of Br (slight). Ether .coloured 
H 
| 
yellowish-red. 
i 
Cl 
0-500 „ 
Strong smell of chlorine, and white 
pp. of AgCl. 
i 
[ I 
1-000 „ 
Iodine in abundance. 
4 
1 Br 
o-ooi „ 
Could not obtain with certainty the 
This is the only 
| 
bromine. 
case, which I at- 
1 
1 Cl 
o 
o 
o 
Smell of Cl and white pp. of AgCl. 
tribute to the 
large quantity of 
f I 
o-ooi H 
Red colour in bulb,* no violet vapour, 
iodine. 
starch, slight blue. 
* The presence of 
K 
Br 
o-oio „ 
Bromine smell and ether coloured red. 
the N0 3 inter- 
0< 
Cl 
o-ioo „ 
Chlorine smell, and white pp. of 
fered. 
AgCl. 
.no 3 
1-000 „ 
Nitrous fumes mixed with the 
bromine. 
r i 
o 
1 — 1 
p 
o 
Red colour in bulb, no violet vapour, 
starch blue. 
C\ 
! Br 
o-oio „ 
Starch coloured deep* yellow, ether 
* Cl colours starch, 
0^ 
\ 
red. 
but the colour 
no 3 
1 "o00 ii 
Nitrous fumes in abundance. ' 
is a very light 
l C10 8 
0-500 „ 
Strong smell of chlorine, and white 
yellow. 
pp. of AgCl. 
/I 
o-ooi „ 
Red colour in bulb, violet vapour, 
starch coloured blue. 
Br 
o-ooi „ 
Starch coloured yellow, ether coloured 
red. 
* Ifthereisastrong 
! Cl 
o-ooi „ 
White pp. of AgCl. 
effervescence, on 
7 , 
S0 3 
o-ioo „ . 
Smell of burning sulphur, discoloured 
addition of first 
iodine solution.* 
two drops of acid, 
s 
o-oio „ 
Smell of H 2 S, black spots on lead 
add more until 
paper.* 
eff er vescence 
co 3 
1-000 „ 
C0 2 reaction, strong effervescence. * 
ceases. 
