Magnification 13 Mechanical Stages 78 Megascope 91 Micrometers 73 Micrometer Eye-piece 73 Micrometer with squares 73 Micrometer-screw 18 Microscope after Dölken 52 " " Nebelthau 50 " " Unna 33 " stereoscopic 69 " mineralogical 57 " for dissections 62 " for reading thermometer scales 102 " for the examination of trichinae 48 Microscopical Cases 103 Micro-Spectroscope 70 Microtomes 92 Microtome knives 96 Moist chamber 100 =N.= Nansen's Microscope 102 Nebelthau's Microscope 50 Net micrometers 73 Nose-pieces 100 Notice 4 =O.= Object Marker 101 Objectives achromatic 12 " apochromatic 14 " photographic 85 Ocular for Demonstrations 101 Oil-Immersion 12, 14 Opaque illuminator 102 Outfit for Sputum Examinations 103 =P.=