Rouelle, while in England Humphry Davy expounded the same idea in the experimental demonstrations which gave his lectures their brilliant charm.
Bergman worked in the same direction; while Rouelle was attracted to the study of animal chemistry.
GUILLAUME FRANCOIS ROUELLE (1703-1770), French chemist, was born in 1703 at Mathieu, near Caen.
He is known as Rouelle the elder, to distinguish him from his younger brother and assistant, Hilaire Marin (1718-1779), who, on his resignation in 1768, succeeded him as demonstrator at the Jardin du Roi.
Rouelle, is found in the urine of mammalia, birds and some reptiles; human urine contains approximately 2-3%, a grown man producing about 30 grammes daily.
De Lacaille, chemistry with the elder Rouelle and botany with Bernard de Jussieu.