Opened Adjustment, 97 



Optical Axis, 49 



Orthoscopic Eyepiece, 1 16 



Over Correction, 95 



PARFOCAL EYEPIECES 119 



Penetration, 103 



Periscopic Eyepiece, 116 



Pillar of Microscope, 45 



Pinion, 63 



Plankton Work, 58 



Pleurosigma ^.ngulatum, 109, 131, 132, 133, 138, 141,146, 150 



Positive Eyepiece, 114 



Power, Magnifying 21, 38, 109 



Primary Colors, 24 



Principal Axis, 19 



Principal Focus, 19 



Projection Eyepiece, 117 



RACK AND PINION, 47, 63, 177, 178 



Radius of Lens, 19 



Ramsden Eyepiece, 116 



Reading Glass, 31 



Real Focus, 20 



Real Image, 22 



Refraction, 16, 17 



Resolving Power, 91 



Revolving Diaphragm, 70 



Revolving Nosepiece, 60 



Revolving Stage, 55 



SCREW MICROMETER, 173, 65 



Screw, Universal, . 46 



Searcher Eyepiece, 115 



Secondary Colors, 94 



Short Tube Microscopes, 50 



Simple Microscopes, 15, 28 



Slide, Object, 49 



Sliding Tube Adjustment, 47, 177 



