Direct-vision spectroscope adapted for use with a microscope. Is inserted on the body-tube instead of the eyepiece. The instrument, which analyzes light decomposed by a prism train, was used for the spectroscopic analysis of microscopic specimens such as blood samples. Built by Nachet, which first offered it for sale in 1881. Belonged to the Gabinetto degli Invertebrati of the Istituto di Studi Superiori of Florence.