An essay on the comparative merits of artificial and natural classification, as applied to diseases of the skin ... / [John Paget].

  • John Paget
Date:
1833
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Licence: Public Domain Mark

Credit: An essay on the comparative merits of artificial and natural classification, as applied to diseases of the skin ... / [John Paget]. Source: Wellcome Collection.

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    racterize the group. The form of the eruption is various and un¬ certain, and is sometimes accompanied by the presence of pediculi. These diseases are almost peculiar to the filthy and ill-fed ; they are little inclined to cure spontaneously, but, except in certain forms, yield readily to treatment. Genus I. Scabies.—An eruption common to man and many domestic animals. This disease, in its true form, is eminently con¬ tagious ; it is marked by vesicles, pointed at the top, wide at the base, generally distinct, yielding a fluid commonly serous, but sometimes purulent; especially characterized by violent itching. This disease attacks alike either sex, and every age; it extends over the whole body, except the face, but is most common about the interstices of the fingers, the inner surface of the wrists, the folds of the elbows and knees, under the axilla, on the lateral parts of the abdomen, on the thighs, &c. Species. 1. S. exquisita ; 2. S. spuria ; 3. S. pecorina. Genus II. Prurigo—A non-contagious eruption, characterized by papulae, occupying one or more parts of the integuments, vary¬ ing in number and extent, sometimes red, but more frequently of the colour of the skin, and often interspersed with small black scabs produced by scratching. The appearance of these papulae is always attended by an acute sensation of itching, which must be in this case regarded as a special and characteristic symptom. Species. 1. P. lichenoides vel furfurans ; 1. P. formicans ; 3. P. pedicularis ; 4. P. latens. I am at a loss to conceive why M. Alibert should have placed this group in the situation it now occupies between the strumoe and hcematodes, with which it does not appear to have the most distant affinity. I should be inclined rather to place it between the Tinece and Serpigines, to which it appears much more naturally related. Group X.—Hcematodes. This group is composed of a peculiar class of affections, charac¬ terized by discoloration of the skin, caused by an effusion of blood under the epidermis. On what this curious phenomenon may de¬ pend, is yet a mystery ; but it seems probable that it arises either from disease of the minute blood-vessels, or perhaps more likely from a morbid state of the vital fluid itself. Genus I. Peliosis—(Purpura, Willan.)—An affection charac¬ terized by spots of a red, purple, or livid colour, occasionally of a very considerable size, sometimes but small, arising from the effu¬ sion of blood between the cuticle and true skin, and accompanied by haemorrhagies which are excited by the slightest causes. These spots are sometimes distinct, sometimes in groups; they are rarely attended with fever. Species 1. P. vulgaris; (Purpura simplex, Willan;) 2. P. heemorrhagica ; 3. P. contusa. Genus II. Petechia—An affection characterized by small spots scattered over the surface of the skin, generally of a red colour, though often livid, violet, or black; sometimes resembling flea- 4
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