Johann Philipp Gustav von Jolly (26 September 1809 – 24 December 1884) was a German experimental physicist.
[1] During his studies he worked in Vienna as a mechanician for factories and mining plants, before returning back to Heidelberg in 1834, where he received his PhD.
[3][4] One of Jolly's students at the University of Munich was Max Planck, whom he advised in 1878 not to go into theoretical physics.
He described physics to me as a highly developed, nearly fully matured science, that through the crowning achievement of the discovery of the principle of conservation of energy it will arguably soon take its final stable form.
It may yet keep going in one corner or another, scrutinizing or putting in order a jot here and a tittle there, but the system as a whole is secured, and theoretical physics is noticeably approaching its completion to the same degree as geometry did centuries ago.