Because he was weak and vulnerable, the young Le Roy was sent to the Mediterranean city of Montpellier where he began to study medicine, which he continued in Italy.
He had a wealth of experience, and it was a great loss for Montpellier when he returned to Paris in 1777 at the urging of his family.
In 1755, Le Roy tried to cure a patient of his blindness by sending electric current pulses through a wire wound around the head.
[2] This is considered the first experimental evidence that nerves could be electrically stimulated, 36 years before the description of electrophysiological phenomena by Galvani.
Le Roy regularly cooperated to Volumes I, II, III, VI and VII of the Encyclopédie by Diderot and D'Alembert.