. A practical treatise on diseases of the skin, for the use of students and practitioners. and,in recently formed patches, distention of blood- and lymph-vesselsin the papillary layer of the corium beneath. In older plaques therete either dips downward to an unusual extent between the papillae,or the latter push upward in the manner of wart-like is reasonable to conclude that at times both hypertrophies corium is thickened later by an increase of its elements which may 1 In his admirable Photographic Illustrations of Cutaneous Diseases. New York. INF LAMM A TIONS. 2
. A practical treatise on diseases of the skin, for the use of students and practitioners. and,in recently formed patches, distention of blood- and lymph-vesselsin the papillary layer of the corium beneath. In older plaques therete either dips downward to an unusual extent between the papillae,or the latter push upward in the manner of wart-like is reasonable to conclude that at times both hypertrophies corium is thickened later by an increase of its elements which may 1 In his admirable Photographic Illustrations of Cutaneous Diseases. New York. INF LAMM A TIONS. 259 involve its entire width as far as the connective tissue. In the olderplaques, also, the connective-tissue elements are often separated by aslight serous infiltration. Hyper-pigmentation is also noted. Theexternal root-sheath of the hairs in direct connection with the reteparticipates in the same process, thus explaining the defluvium capillitiiof certain cases, and the resulting transient or permanent sebaceous glands are secondarily involved in the scalp only. MP- c-. Vertical section of skin from a patch of psoriasis of long standing : MP, Malpighianprolongation ; C, corium; L, leucocytes. (After Jamieson.) Lang,1 of Innsbruck, attracted notice by his alleged discovery ofcertain fungous elements in psoriasis that he claims to be the cause ofthe disease. These fungi he finds in the whitish pellicle beneath thesuperficial squamous layer, to which Bulkley had already called atten-tion. After stripping the pellicle or a part of it from the surface, andsubjecting it to the action of a 5 per ceut. solution of caustic potash,the epithelium becomes translucent, aud upon and beneath the epithe-lium double-contoured and highly refractive spores become considers this fungus to be of the lowest species, different fromany previously recognized upon the skin, and he terms it epidermo-phyton. In his treatment of psoriasis this author proceeds upon the 1 Viert.
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