INDEX 



Abbe apertometer, 270-272. 



Abbe camera lucida, 123-132. 



Abbe condenser or illuminator, 45-50. 



Abbe's test-plate, method of using, 268- 

 270. 



Aberration, chromatic, 4, 5 ; by cover- 

 glass, 55 ; spherical, 4, 5, 26S. 



Absorption spectra, 136-139, 145-150. 



Acetelyne light, 37, 51, 229. 



Achromatic condenser, 42-43, 256 ; objec- 

 tives, 11, 64 ; oculars, 22. 



Achromatism, 12. 



Actinic focus, 226 ; image, 221. 



Adjustable objectives, II, 12, 54-57 ; ex- 

 periments, 54 ; and micrometry, 11S ; 

 and photo-micrography, 234. 



Adjusting collar, graduation of, 55. 



Adjustment, of analyzer, 151 ; coarse or 

 rapid, and fine, 63, Frontispiece ; of 

 objective, 11, 12, 54; of objective for 

 cover-glass, specific directions, 55 ; 

 testing, 63. 



Aerial image, 30, 31, 230. 



Air bubbles, 94, 95. 



Albumen fixative, Mayer's, 198. 



Alcohol, absolute, 198; ethylic, 198; 

 methyl, 198, 203. 



i^lcoholic dve, staining sections with, 

 1S9. 



Alum solution, 19S. 



Amici prism, 134, 140. 



Amplifier, 109. 



Amplification of microscope, 103. 



Analyzer, 141, 151. 



Anas'tigmatic objective, 20S, 212. 



Angle, of aperture, 15, 16 ; of carbons for 

 arc lamps, 251-252 ; critical, 54. 



Angstrom and Stokes' law of absorption 

 spectra, 13S. 



Angular aperture, 15, 16. 



Anisotropic, 152. 



Apertometer, Abbe's, 270. 



Aperture of objective, 15, 21, 270; angu- 

 lar, 15, 16; formula for, 16-18; of 

 illuminating cone, 45 ; numerical, 17, 

 19, 270 ; numerical of condenser, 44 ; 

 significance of, 20. 



Aphengescope, 267. 



Aplanatic cone, 46 ; objectives, 11 ; ocu- 

 lar, 22 ; triplet, 7. 



Apochromatic condenser, 42 ; objectives, 

 12, 64, 214. 



Apparatus and material, 1, 34, 90, 103, 

 1.22, 134, 205, 243 ; for micro-projec- 

 tion, 256, 257 ; for photography, 233 ; 

 for photo-micrography, 205. 



Appearances, interpretation, 90-102. 



Arc lamp, 37, 229, 250-255 ; continuous 

 current, 249. 



Arrangement of condenser, 46 ; of lamp, 

 bull's eye and microscope, 51 ; mi- 

 nute objects, 204 ; serial sections, 

 192; tissue for sections, 191. 



Artifacts, 91. 



Artificial illumination, 37, 48, 50 ; for 

 photo-micrography, 229. 



Avoidance of diffusion currents, 180 ; of 

 distortion, 124. 



Axial light, 36 ; experiments, 40 ; with 

 Abbe illuminator, 48. 



Axial, point, 15 ; ray, 36. 



Axis, optic, 2, 3, io ; of illuminator, 49 ; 

 secondary, 3. 6, 49. 



Back-ground for photographing, 209. 



Back combination or system of objective, 

 9-13. 



Bacterial cultures, photographing, 241- 

 242. 



Balsam, 199 ; bottle, 183 ; mounting in, 

 1S3, 190 ; preparation of, 199 ; re- 

 moval from lenses, 61 ; natural, 190, 

 199 ; neutral, 199 ; removal from 

 slides, 162 ; xylene, 199. 



Bands, absorption, 137. 



Base of microscope, Frontispiece. 



Bath, water, 255. 



Bed, camera, 207. 



Benzin, removing from sections, 189. 



Biaxial crystals, 154. 



Bibliography, 26, 33, 99, 101, 121, 133, 

 150. 155, 157. 158,159. T 96, 204, 220, 

 240, 242, 251, 258, 267, 273, 274, 282. 



Blocks for collodion, 178 ; for shell vials, 

 174. 



Blood, absorption spectrum of, 146 ; cir- 

 culation of with micro-projection, 

 257,. 264. 



Board, circulation, 280. 



Body of microscope, Frontispiece. 



