Christian Ehrenfried Weigel
Chemistry, Pharmacy, Botany, Mineralogy
Google: "Christian Ehrenfried Weigel"
(1748 - 1831)
Note: The judicia by Vogel and by Erxleben are attached at the end of Weigel's thesis, see the link to Weigel's online thesis. It presumably means that Vogel and Erxleben were on his committee. On page 2/3 of his dissertation he acknowledges Vogel as his 'praeceptor'.