First variety (very closely related to psoriasis), Parapsoriasis guttata. Jadassohn’s case is probably to be referred to it. Second variety (intermediate between Lichen and psoriasis), Parapsoriasis lichenoides, including Parakeratosis variegata of Unna, and Lichen variegatus (Crocker). Third variety (closely allied to Seborrhœa psoriasiformis), Parapsoriasis in patches, corresponding to Erythrodermie pityriasique en plaques disseminées of Brocq, and of which cases have also been reported by J. C. White and C. J. White. It is only with the third variety that comparison need be made, the deep colour and very small pattern, like a mosaic of the first two, sharply contrasting with the broad effects as of colour dashed on, in Xantho-erythrodermia perstans. For the whole group Brocq gives the following characteristics: (1) An almost complete absence of pruritus. (2) A very slow evolution. (3) A distribution in circumscribed, sharply defined patches, whose dimensions are from 2 cm. to 6 cm. in diameter, and which are scattered here and there over the integument. (4) An almost complete absence of infiltration of the derma. (5) A pale redness (pinkish coloured). (6) A fine pityriasic desquamation. (7) An extraordinary resistance to the local applications usually employed in the treatment of psoriasiform or pityriasic seborrhœa, in fact, only yielding slowly and imperfectly to the most energetic application of pyrogallic acid. The special features of the third variety he describes as: (1) Being in patches, circumscribed, sharply defined from 2 cm. to 6 cm. in diameter. (2) They are scattered irregularly over the skin without any apparent system. (3) The colour varies from a pale red to a brownish or livid red, according to the part affected. (4) There is always present a fine pityriasic desquamation more or less marked in different cases. (5) There are at times in some of these cases, aggregations of small flattened papules which may be considered as links connecting it with the second variety. (6) There is no infiltration of the integument appreciable to the eye or touch. (7) The face is rarely affected, and there is the same extremely slow evolution, great resistance to local treatment, and few or no subjective symptoms. Referring to the whole group, he says: “We know nothing very definite about the etiology or pathology of these affections. They may appear at any age, but seem more frequent in youths or adults. He has observed cases in men and women and in all classes of society. They seem to be slightly more frequent in women than in men.”