Max Julius Louis Le Blanc was a German physical chemist who worked in the field of electrochemistry, writing an influential textbook in 1895 on the subject which went through several editions. He was
Max Le Blanc 1901 Karlsruhe
Wilhelm Friedrich Ostwald was a Baltic German chemist and philosopher. Ostwald is credited with being one of the founders of the field of physical chemistry, with Jacobus Henricus van 't Hoff, Walther
Photograph of Ostwald c. 1913
Jacobus van 't Hoff (left) and Wilhelm Ostwald
Liesegang rings at Saginaw Hill, Arizona, USA