Joachim Georg Darjes, a professor at Jena and later at Frankfurt/Oder, became Haller’s brother-in-law in 1741. The first three of his fifteen surviving letters to Haller date from 1742, the next eleven from the years 1748–1752, and a final one from 1764. An additional letter is addressed to Haller’s wife. None of Haller’s letters to Darjes has survived. Darjes reports on his efforts to procure requested plants for Haller and on mutual exchanges of local publications; defends their father-in-law’s role in a bitter intra-family quarrel; pursues complaints about negative reviews of their books; comments on professorial posts and academic disputes; and in 1752 rejects the suspicion that he betrayed Haller in a controversy. Not least, he follows the financial and commercial ventures that involved both Haller and him, regarding their inherited property and their business in balsamic remedies.

This is a guest edition prepared by Otto Sonntag, which philologically follows the general guidelines for guest editions of hallerNet (Editionsmodell Gasteditionen Version 1.0). Information specific to this edition is given in the chapter "Editorial Principles". In contrast, the marking of the entities (persons, publications, institutions, places, and letters) adheres to the general guidelines of hallerNet (Konventionen Strukturdaten Version 2.3).