Microscope by R. B. Tolles (unsigned), Boston, United States, c. 1870. (Tolles own working instrument.) Consists of: no mirror, substage fitted with standard thread fitting, early object lens (incomplete), rotating diatom stage, stage fitted with lens in centre, experimental centering stage (not fitting, but by Tolles), ordinary eyepiece, solid eyepiece (572) patd 1855, eyepiece (680') with micrometer on Coddington field lens, patd Sep.25 1855, Tolles' special eyepiece (573'), 1/16 patent eyepiece by Gundlach patd 1879, 1/6 immersion lens in case(802) [the celebrated "sixth" of the aperture controversy], two brass shields used by Wenham with above, in glass topped brass box(860), 1/10in water immersion object glass by Tolles, in case, 1/4in o.g. with prism illumination in case(801), Nosepiece Rotator(232), Tolles large transparent stage and aperture measurer(427), candle holder(446), 1/4in object glass by Tolles with conical front, in cardboard case (not original), amplifier by "Tolles, Boston", camera Lucida by Tolles, 4-in amplifier by Gundlach in case(298), transverse substage by Tolles (426), (215).