In a paper addressing the problem that the majority of chiral compounds crystallize as racemates instead of conglomerates, Jack Dunitz coined the expression “Wallach’s Rule”. The paper gives credit to Wallach’s publication in Liebigs Annalen der Chemie in 1895, in which, among other work, a comparison of crystal density of racemates and their homochiral analogues was reported. Of the nine compounds investigated, eight showed higher densities for the racemates. Although Wallach was the only author of the Annalen paper, it was not Otto Wallach, but Theodore Liebisch, Wallach’s colleague from the mineralogy institute in Göttingen at that time, who performed the experiments and reported these results. Short overviews about the CVs of the contemporaries Wallach and Liebisch, as well as Liebisch’s postdoc Sommerfeld, are presented. It is discussed whether Wallach or Liebisch had the idea to study crystal densities and which one of the two scientists should be properly credited with proposing “Wallach′s Rule”.