Langenhan—-The Arsenical Solutions. 
157 
LIQUOR POTASSII ARSENITIS U. S. P. 1870 
Solution of Arsenite of Potassium 1 
Ingredients. 
Take of Arsenions Acid, 4 in 
small pieces, 5 
Bicarbonate of Potassium, 6 each, 
sixty-four grains; 7 
Compound Spirit of Lavender 
half a fluidounce ; lx 
Distilled Water 8 a sufficient 
quantity. 
Directions. 
Boil the Arsenious Acid and Bi¬ 
carbonate of Potassium, in a glass 
vessel, with half a fluidounce 9 of 
Distilled Water, until the Acid is 
entirely dissolved, 10 and add twelve 
fluidounces of Distilled Water. 
Then add the Compound Spirit of 
Lavender, and afterwards enough 
Distilled Water to make it meas¬ 
ure a pint. 12 
LIQUOR POTASSII ARSENITIS U. S. P. 1880 
Solution of Arsenite of Potassium 
[Fowler’s Solution.] 1 
Arsenious Acid, 4 in small pieces, 5 one part 7 ... 1 
Bicarbonate of Potassium, 6 one part 7 .... 1 
Compound Tincture of Lavender, 11 three parts .. 3 
Distilled Water* a sufficient quantity, 
To make one hundred parts 12 . 100 
Boil the Arsenious Acid and Bicarbonate of Potassium in a 
glass vessel with ten (10) parts 9 of Distilled Water, until the Acid 
is completely dissovled. 10 Then add the Compound Tincture of 
Lavender, and enough Distilled Water to make the product weigh 
one hundred (100) parts. Lastly, set the mixture aside for eight 
days and then filter through paper. 3 
If 24.7 Cm. of the Solution are boiled with 2 Gm. of bicarbonate of 
sodium, the liquid, when cold, diluted with 100 C.c. of water, and some 
gelatinized starch added, should require from 48.5 to 50 C.c. of the vol¬ 
umetric solution of iodine, before the blue color ceases to disappear on 
stirring (corresponding to 1 per cent, of arsenious acid of the required 
purity). 15 
