ARSENIC. 
§ 742 -] 
diseases ; it is a solution of the iodides of mercury and arsenic ; strength, 
about 1 per cent, of each of the iodides. 
Arseniate of Iron, Fe 3 As 2 0 8 , is an amorphous green powder, used to 
some extent in medicine. It should contain 33-6 per cent, of metallic 
arsenic. 
Lead Arsenate. —Lead arsenate has come of late years into general 
use as an insecticide. It is made by precipitating sodium arsenate with 
the acetate or nitrate of lead. According to Spencer K. Pickering 
( Journ . Chem. Soc., T., 1907), when lead acetate is the precipitant, the 
result is the triplumbic salt Pb 3 (As0 4 ) 2 ; but when the precipitant is 
the nitrate the arsenate formed is Pb 2 H 2 (As0 4 ) 2 , the diplumbic salt. 
Calcium arsenate has also been used for the same purpose. 
Clemen’s Solution. —A solution of the bromide and arseniate of 
potassium ; strength equal to 1 per cent, arsenious acid. Official in 
U.S., France, and Norway. 
Pilula Asiatica (not official) is composed of arsenious acid, extract 
of gentian, and black pepper. There is T Vtli of a grain (54 mgrms.) 
of arsenious acid in each pill. 
Dr De Valanguis’ Solutio solventes mineralis is composed of 30 
grains of As 2 0 3 dissolved by 90 minims of HC1 in 20 oz. of water ; 
strength =0 # 34 per cent. As 2 0 3 . 
2. Veterinary Arsenical Medicine. —Common veterinary prepara¬ 
tions containing arsenic are :—A ball for worms, containing in parts— 
Calomel 
Arsenious acid . 
Tin filings . 
Venice turpentine 1 
1-3 
1-3 
per cent. 
99 
77-9 
19-5 
>» 
99 
A common tonic ball : 2 — 
Arsenious acid 
Aniseed 
Opium . 
Treacle . 
5 to 10 grains (-324 to -648 grm.) 
\ oz. (14-1744 grms.) 
30 grains ( 1-94 „ ) 
q.s. 
An arsenical ball, often given by grooms to horses for the purpose 
of improving their coats, contains in 100 parts :— 
Arsenious acid ...... 2-5 per cent. 
Pimento ....... 19-2 „ 
Extract of gentian ..... 78-3 „ 
Another ball in use is composed of arsenic and verdigris (acetate of 
copper), of each 8 grains (-518 grm.) ; cupric sulphate, 20 grains (1*3 
grm.) ; q.s. of linseed meal and treacle. 
1 The Venice turpentine is rarely found in ordinary commerce, what is sold under 
that name consisting of black resin and oil of turpentine. 
2 A similar preparation in common use has the addition of sulphate of zinc. 
36 
