SUMMARY. —At a time when relativistic and quantum notions held a small place in French science, Jacques Solomon focused, from the end of the 1920 's ; on theoretical research in relativistic quantum physics; the quantum field theory, the quantization of gravitation, and nuclear phenomena were the main bases of his questions, until his death in 1942. Solomon's scientific approach, indicator of the development of the new quantum physics in France, is a result of various traditions : the trend in Copenhagen quantum physics in the tradition of Bohr and Rosenfeld, and theoretical physics in France, on the one hand in the tradition of Langevin, and on the other hand in the tradition of mathematical physics represented by Poincaré.RÉSUMÉ. — Alors ...