gems engraved by natter were described by erich raspe in his "catalogue" of the tassie collection. among natter's imitations of the antique was his copy of the medusa, with the name sosikles, at that time in the cabinet of tiberius hemsterhuis, a correspondent of natter's. he also copied the "julia titi of evodus". a description of his works preserved in the imperial cabinet at st. petersburg was given in j. bernoulli's "travels", iv. 248.