Puate 23.—(X400, H&E) Transepidermal with disorganization of the malpighian layer. granulosum absent. damage Stratum Malpighian and basal layer only two to three ceils thick with exfoliation of pigment outward toward parakeratinized zone adjacent to stratum corneum. Some pigment laden chromatophores and histtocytes in pars papillaris of corium. Latter is lymphocytes, and mononuclear phagocytes. Capillary edematous and infiltrated by moderate numbers of loops indistinct. Case 26. Puate 24.—(X100, H&E) Transepidermal damage with disorganization of the malpighian layer. Slight parakeratosis. Migration or exfoliation outward of pigment. Loose lamination of stratum corneum, Pigment laden chromatophores and histiocytes in superficial pars papillaris of cortum. Marked cellular infiltration and edema of pars papillaris. Slight telangiectasis of superficial pars reticularis. Case 63. 22 days post-exposure. Plates 25 and 26 (53 days post-exposure). Puate 25.—(X100, H&E) (Case #75) Loose lamination of stratum corneum with outward papillary projec: tions and resultant “‘rugose’’ appearance. Stratum granulosum of good width. Basal and malpighian layers distinct with pigment present. Slight edema of cortum with mild telangiectasts and slight increase in perivascular lymphocytes and pericytes. Small somewhat atrophic hair follicle adjacent to sebaceous gland— in mid pars reticularis. PLate 26.—(X400, H&E) (Case #75) Same as 25. Occasional perinuclear cytoplasmic halos in mid stratum granulosum. Loosely laminated stratum corneum. (Pigment laden chromatophores in superficial coritum along with occasional lymphocytes and mononuclear phagocytes.)