Over-Correction of Objectives, To Judge, 87 



Parfocal Eyepieces, 106 



Penetration 94 



Periscopic Eyepiece, 109 



Photographic Microscope Objectives 64 



Pillar, 29 



Pinion, 32, 198 



Plane Mirror, 52, 121 



Use with Condenser, 159 



Plankton Work, 40 

 PleurosigmaAngulatum, 100,133,134,136,139,144,148,193 

 Pocket Magnifiers, 1424, 193 



Positive Eyepiece, 107 



Posterior System of Objective, 66 

 Powers of Objectives, 62, 99, 101 



Primary Colors, 11 



Principal Axis, 5 



Principal Focus, 5 



Prism, Dispersion of Light by, 11 



Refraction of Light by, 2 



Projection Eyepiece, 109, 112 



Projection Objectives, 65 



Quadruple Nose-piece, 43, 118 



Quadruple System of Lenses, 66 



Rack and Pinion, Substage, 157, 158 

 Rack and Pinion Coarse Adjustment, 32, 46. 183 



Rack and Pinion Mechanical Stage, 41 



Radius of Curvature, 5 



Ramsden Eyepiece, 109 



Rating of Eyepieces, 104 



Rating of Objectives, 62 



Reading Glass, , 17 



Real Focus, 6 

 Real Image, 8, 58, 105, 106 



Refraction, 2 



