2. (P. Cod.) Alum, nitre, and blue vitriol, of each 3 oz.; camphor, 1 dr.; as last.
3. (Woolfuss.) Blue vitriol, nitre, alum, and camphor, equal parts, melted together, adding the camphor last. Astringent and detergent. 1 oz., dissolved in water, 1 pint, formed a once celebrated lotion. 1 dr. in water, 1 pint, is still used as a collyrium.
Lapis Inferna′lis. See Nitrate of Silver.
Lapis Lazu′li. See Ultramarine.
Lapis Lydius. Syn. Lydian stone. A siliceous slate, used as a touchstone by jewellers.
Lapis Medicamento′sus. Syn. Medicinal stone; Lapis mirabilis, L. Prep. (Ph. L. 1746.) Alum, litharge, and Armenian bole, of each 6 oz.; colcothar of green vitriol, 3 oz.; vinegar, 4 fl. oz.; mix, and evaporate to dryness. Formerly used to make an astringent and detergent lotion:—1 oz. to water, 1 pint. Once a popular application to ulcers, and in other cases; now disused.
Lapis Vulnerar′ius. Very similar to Lapis divinus.
LARCH BARK. The inner bark of the Larix Europœa, the common larch, has been lately introduced, under the form of a tincture, into the British Pharmacopœia.
Dr Stenhouse obtained from the bark a peculiar volatile constituent, possessed of acid properties for which the name of lariximic acid has been proposed. The other trees of the pine family are deficient in this acid. The young bark abounds most in it. Gum, starch, resin, and that variety of tannic acid, which forms olive green precipitates with the salts of iron, have also been found, in addition to other substances, in larch bark.
The inner bark, employed internally, has a special action on the mucous membranes, and