INDEX. 



Abbe Camera Lucida, 168173, 193 



Optical Construction of, 168 



Abbe Condenser, 154 



Abbe Test Plate, 142 



Aberration, Chromatic, 10, 85 



Correction of, 12 



Spherical, 9, 12, 88, 138 



Accessories to Microscope, 192 



Achromatic Combination or Lens, 13 



Adjustable Objectives, 64, 93, 143 



Adjustments, Coarse and Fine, 32, 45, 48 



Care of, 198 



Closed and Open, 93, 143 



Amplification, 100 



Angle, 70, 72 



Angular Aperture, 70, 80, 101 



How to Measure, 80 



Anterior System of Objective, 66 



Apertometer, 82 



Aperture, 72, 162 



Numerical, 77 



Of Condenser, 162 



Aplanatic Lens, 13 



Aplanatic Triplet, 16, 23 



Hastings', 16, 23 



Apochromatic Objectives, 102 



Apparent Aperture, 163 



Areas Magnification, 24 



Arm of Microscope, 29 



Astigmatism, 131 



Attachable Mechanical Stage, 41, 188 



Axis, Optical, 34 



Principal, 5 



