He researched electrical phenomena, sending a current from a Leyden jar through a wire 950 toises (about 1,850 m) long and concluded that electricity propagated "instantaneously" in the wire. In the same year, he also began working at the hospital of Saint Germain en Laye as a physician. In 1739 he accompanied the expedition of César-François Cassini de Thury and Nicolas Louis de Lacaille to extend the Meridian of Paris and documented mines and the geology and botany along the route. Louis-Guillaume Le Monnier worked in physics, geology, medicine, and botany. Louis-Guillaume's older brother was the astronomer Pierre Charles Le Monnier. He was born near Vire as the son of Pierre Le Monnier (1675–1757), who was a scientist himself and a member of the French Academy of Sciences. Louis-Guillaume Le Monnier (sometimes written as Lemonnier) (27 June 1717 – 7 September 1799) was a French natural scientist and contributor to the Encyclopédie ou Dictionnaire raisonné des sciences, des arts et des métiers.
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