Delbet is remembered for his advocacy of magnesium chloride. During World War I, Delbet was searching for a solution that could cleanse wounds but not damage tissue as traditional antiseptics did. In 1915 he found that magnesium chloride not only worked as an antiseptic, but was also harmless to body tissue. Serendipitously, he discovered that when the magnesium chloride solution was taken orally or intravenously, it appeared to be a remedy for other ailments. Delbet also believed that magnesium was beneficial to the efficiency of white blood cells, of which he described in his treatise "Politique Préventive du Cancer".
- Clinique chirurgicale, with Ulysse Trélat; 2 volumes, Paris, 1891.
- Précis d’anatomie topographique, with Nikolaus Rüdinger; Paris, 1893.
- Asepsie opératoire, with L Bigeard. Paris, 1901. - Aseptic surgery
- Chirurgie artérielle et veineuse, Paris, 1906. - Arterial and venous surgery.
- Névralgies du trijumeau, with Maurice Chevassu; Paris, 1911. - Trigeminal neuralgia.
- Méthode du traitement des fractures, Paris, 1916.