  We report on the retrieval of the last missing papers of the "Senatore
folder", given by Majorana to one student of his in Naples in 1938, just before
his disappearance. The mentioned manuscript is conserved at the Domus
Galilaeana in Pisa (Italy), and was written in French, probably for a
conference in Leningrad (or in Kharkov) in 1933 (or in 1934). Majorana was
invited to attend to such a conference but, actually, he did not tke part to
it. The retrieved text deals with quantum electrodynamics by using the
formalism of field quantization. It is here reported, for the first time, in
translation. An accurate historical and scientific account is given as well.
