The Acid Number of the Lipids on the Intact and the Stripped Skin Surface in Psoriatics*†*From the Department of Dermatology and Syphilology, New York University Post-Graduate Medical School (Dr. Marion B. Sulzberger, Chairman) and the Skin and Cancer Unit of University Hospital, New York 3, N.Y.†This investigation was supported by Grant DA-49-007-MD-753 from the Research and Development Division, Department of the U.S. Army.