De l'obésité: étiologie, thérapeutique et hygiène. Thèse présentée et soutenue le 12 Aout 1875.

Primarily a summary of research on the subject to date. Worthington was an American from Cincinnati who received his M.D. in Paris in 1876, and practiced there until 1879, when he returned to the U.S.A. A geneological study of the Worthington family states that he changed his name to Lewis Nicholas Worthington in 1882. Digital facsimile from the Hathi Trust at this link.