Berzelius (Jöns Jacob) Autograph letter signed (‘Jac. Berzelius’), in Swedish, to the biologist C.G.L. Reinwardt in Leiden, mentioning the botanist Elias Fries, on Swiss Academy of Sciences letterhead, two leaves, upper right-hand corner glued, slight toning, minor marginal soiling, traces of wax seal and little loss to verso, few folds, 4to, Stockholm, 31 May 1833.