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It is offered a preview of the lengthy, intense and rich exchange of scientific correspondence (currently in press) which took place in the period from 1931 to 1937 between Ettore and Quirino Majorana. This collection of letters provid es insight into the specifically experimental and theoretical aspects tied to the study of change s in photoresistance in thin metal films exposed to light in suitable conditions and the pos sible identification of new effects of a photoelectric type. It also leads us to realise tha t many theoretical parts of the most mature papers by Quirino Majorana are attributable in fact to Ettore, and moreover allows us to identify Ettore as being, in a certain sense, the co -author of those publications and studies, thanks al so to the constant role he played vis-a-vis his uncle Quirino as a methodologically astute cri tic and epistemological guide. It is pointed out, furthermo re, that this correspondence allows us to recognise Ettore as the true author of the Lecture on Galvani that Quirino Majorana presented in Bologna in 1937, on the occasion of a great interna tional Congress organised to celebrate the second centenary of the birth of Luigi Galvani. Fin ally, the article refutes the widespread and common belief that after 1933 Ettore no longer conc erned himself with physics.

E.Majorana as a Guide in Quirino Majorana's Experiments. Original letters and documents on an experimental and theoretical collaboration