INDEX 



Aberration, chromatic, 288 



correction of, 285, 289, 294 



cover-glass and fig. of, 78, 285-286 



spherical, 284-285, 288 

 Absolute alcohol, 348 



index of refraction, 273 

 Absorption spectra, 251, 259, 264 

 Achromatic condenser, 57-59 



objective, 21, 291 

 Achromatism, 290, 435 

 Achromatization, 290, 435 

 Actinic focus, 222 

 Adjustable objective, 22, 77, 229 



in photo-micrography, 229 

 Adjustment of analyzer, 267-269 



coarse or rapid; fine, 27, 97 



of objective for cover-glass, 77, 229 

 Aerial image, 31, 33 

 Air bubbles, 80, 112 

 Albumen fixative, 348 

 Alcohol absolute, 348 



ethyl, 348-349 



denatured, 349 



methyl, 349 



mixtures, how to make, 347-348 



picric, 363 

 Alcoholic dye, 393 

 Amici prism, 247 

 Amplifier, 139 



for projection, 201 

 Amplification of microscope, 131 

 Analyzer, 264-266 

 Angle of aperture, 294 



critical, 275 



visual and fig., 6, 127, 128-129 

 Angstrom and Stokes law, 252-253 

 Angular aperture, 294-296 

 Anisotropic objects, 268 

 Apertometer, 298 



Aperture, angular and numerical deter- 

 mination of, 297 



numerical, 294-299 



and diaphragm, 62-63 



and opacities, 303-304 



table of, 296 

 Aplanatic objectives, 21 

 Apochromatic condenser, 58 



objectives, 291, 437 



Apparatus and material for chapters, 

 36, 77, 107, 127, 160, 206, 246, 

 270, 3!2, 368 

 Apparent size of objects, 9 

 Appearances, interpretation, 107, 126 

 Arc lamp and fig., 72 

 Arrangement of minute objects, 336 



of serial sections, 404 

 Artificial illumination, 48-52 

 Autochrome photographic plates, 244- 



245 

 Avoidance of inversion in drawings, 



172-176 

 vibrations in photography, 217- 



218 

 Axial light, 65 



experiments with, 65 

 Axis, optic, 282-284 



of projectioti microscope, 200-201 

 secondary, n, 284 



Back combination, 20 



Bacteria, 334-335 



Bacterial cultures, photographing, 213 



Balsam, 339, 350 



acid, 351 



alkaline or neutral, 350 



bottle, 328-329 



filtering, 350 



mounting in, 329-330 



453 



