238 
BRITISH PHARMACEUTICAL CONFERENCE. 
Davis, Harrogate. 
A case containing tubes, exliibiting at a glance tlie relative saline residues 
of a pint of each of the Harrogate waters. 
This case has since been presented to the Museum at Bloomsbury Square. 
Davy, Yates, and Houtledge, 100, Upper Thames Street, London. 
Ferri et quinim citras. 
In scales of a fine greenish golden-yellow colour, freely soluble in water, and yield¬ 
ing a clear, bright solution. It contains 16 ]3er cent, of pure quina, which is equiva¬ 
lent to 25 per cent, of citrate. The process of the B. P,, when strictly adhered to, 
produces scales of somewhat duller colour than those in the sample above referred to. 
Ferri et amnionise citras. 
Made by saturating citric acid with metallic iron, adding liq. ammonioe until the 
white proto-citrate is dissolved, and exposing the solution to atmospheric air until 
oxidized. The liquor is then evaporated to a syrupy consistence, and scaled by ex¬ 
posing to a temperature of 80“ to 100° Fahr. in thin layers on glass or earthenware 
X)lates. The scales thus produced are of a garnet red colour, are readily soluble in 
water, and have a slightly ferruginous taste. 
Ferri xiercitras, in fine garnet-coloured scales. 
Prepared by dissolving freshly precipitated hydrated sesquioxide of iron in citric 
acid, and scaling as described in the remarks respecting ferri ct ammon. cit. It has 
ail acid and slightly styptic taste. 
Ferri pyropbospbas, in beautiful golden green scales. 
Its chemical composition is not, however, accurately represented by the name it 
bears, it being prepared by dissolving pyrophosphate of iron in a mixture of the 
citrates of soda and ammonia; the solution is then evaporated to a syrupy consist¬ 
ence, and scaled in a similar way to the ferri et ammonire citras. 
lodo-cyanide of q)otassium and mercury. 
Prepared by mixing strong solutions of bicyanide of mercury and iodide of potas¬ 
sium in equivalent proportions. The salt is deposited in white, pearly, crystalline 
plates. Its chief use is to detect the presence of small quantities of the mineral 
acids in hydrocyanic acid. 
Hydrarg. subcbloridum, prepared a la vapeur. 
Hydrarg. ammoniatum and bydrarg. biniodidum. 
Benzoic acid made from gum benzoin. 
It occurs in soft, feathery, pearly crystals. When thus made it is much preferred 
to that obtained from the urine of some graminivorous animals, which cannot alto¬ 
gether be deprived of a disagreeable odour by repeated sublimation. 
Potass, permanganas, in fine iridescent needles. 
It is valuable as a disinfecting and oxidizing agent, and has lately been much in 
request as a ready test for the presence of organic matter in water used for drinking 
purposes. It also affords a ready method of detecting the presence of methyl in 
alcoholic compounds. 
Iodide and bromide of cadmium. 
Bromide of ammonium and chloride of gold. 
Principally used for photographic purposes. Bromide of ammonium^ was lately 
in considerable demand as a remedy for whooping-cough. The iodide of cadmium 
exhibited is in fine crystals. 
Valerianate of iron, made according to the process of the Dublin Pbarma- 
copceia. 
It is almost entirely but not perfectly soluble in spirit, which is seldom prac¬ 
tically the case when the salt is thus prepared, owing to a slight decomposition 
which takes place while drying. 
