An essay on the history, preparation, and therapeutic uses of iodine / by Samuel J. Hobson.

  • Hobson, Samuel J., -1882.
Date:
1830
Catalogue details

Licence: Public Domain Mark

Credit: An essay on the history, preparation, and therapeutic uses of iodine / by Samuel J. Hobson. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    ed, such as the doris, the venus, the oyster, &c; and in seve- ral polypii.* Professor Hare speaks of it as having been disco- vered in marine worms, t Doctor Webster says, in his Manual of Chemistry, that it has been detected in various marine animals. May it not exist more or less in all animals inhabiting salt-water ? We shall next examine Iodine as a vegetable constituent; and here we shall find its most prolific source ; it is from this kingdom that we exclusively obtain it. Iodine exists in all the species of the genus fucus of the order algae aquatica of Lin- naeus. Dr. Fyfe| proved it by ocular demonstration to exist in the following fuci:— Fucus Cartilagineus Fucus Palmatus Membranaceus Filum Filamentosus Digitatus ,i, Rubens —- Saccharinus i Nodosus Ulva Umbilicalis Serratus Pavonia. Siliquosus ■ Linza and in Sponge. Upon adding sulphuric acid to a concentrated hot infusion of any of them, the vapour of Iodine was exhaled. Majendie informs us in his Formulary, that M. Balard • The following is M. Balard's process :— After having mixed the liquor which contains the Iodine with starch and sulphuric acid, slowly pour over it a small quantity of an aqueous solution of chlorine ; this liquid, from its less specific gravity, does not mix with the preceding, and, at the part where they touch, a blue zone manifests itself, which, however feeble it muy be, cannot be mistaken. If the vase is lightly agitated, so as to mix a part of the infe- rior liquid with the solution of chlorine which swims on top, the blue tint is developed in the part with which the chlorine is in contact; but if the whole is agitated together, and the two liquors completely mixed, the blue colour disappears immediately, if the chlorine is in excess.—Majendie's Formula- ry, fifth Fr. Edit. t Hare's Minutes, art. Iodine. % Via*. Ure's Chemical Dictionary.