"The research was carried out under the guidance of the Philadelphia committee for the clinical study of opium addiction, in the wards of the Philadelphia general hospital."

Papers no. 1-3, 5-9 are by A.B. Light and E.G. Torrance; no. 4 is by W.G. Karr, A.B. Light and E.G. Torrance; no. 10, by Edith Fry, A.B. Light, E.G. Torrance and W.A. Wolff; no. 11, by A.B. Light.

Reprinted from Archives of internal medicine, v. 43-44, Feb.-Dec. 1929. Published also in eleven separate numbers.

Bibliographical foot-notes.