INDEX. 



Abbe apertometer, 212. 

 Abbe camera lucida, in ; arrangement 

 of, 112; drawing with, 115-118; fig- 

 ures, 98, 110, 114; hinge tor prism, 

 117; inclined microscope with, 115. 

 Abbe condenser or illuminator, 44, 47 ; 

 amount of light for, 43 ; dark-ground 

 illumination with, 48; experiments, 

 46; laboratory microscope with, 61 ; 

 light, axial and oblique, 46 ; mirror 

 with, 46. 

 Abbe's test-plate, method of using, 210. 

 Aberration, chromatic, 4 ; by cover-glass, 



5 1 ; negative, 52 ; spherical, 4, 210. 

 Absorption spectra 122, 135; amount of 

 material necessary and its proper ma- 

 nipulation, 130; Angstrom & Stokes' 

 law of, 123 ; banded, not given bv all 

 colored objects, 133 ; of blood, 131 ; 

 of colored bodies, 123, 133 ; of color- 

 less bodies, 134 ; of minerals, 134 ; 

 of permanganate of potash, 131. 

 Acetylene light, 36, 48. 

 Achromatic condenser, 40, 41 ; object- 

 ives, 12, 61 ; oculars, 23 ; triplet, 7. 

 Achromatism, 13. 

 Actinic focus, 189 ; image, 184. 

 Adjustable objectives, 12, 13, 52 ; experi- 

 ments, 51 ; and micrometry, 106 ; 

 and photo-micrography, 201. 

 Adjusting collar, graduation of, 52. 

 Adjustment, of analyzer, 136 ; coarse or 

 rapid, 60 ; fine, 60 ; focusing, 60 ; 

 of objective, 12, it,, 51 ; of objective 

 for cover glass, specific directions, 

 53 ; testing, 60 ; with graduated col- 

 lar, 53. 

 Aerial image, 30, 31. 



Air bubbles, 84, 85 ; with central and 

 oblique illumination, 84, S5 ; air and 

 oil, distinguished optically, 85 ; by 

 reflected light, 85. 

 Albumen fixative, Mayer's, 175. 

 Albuminous material, removal of, 58. 

 Alcohol, ethylic, 175. 

 Alcoholic dye, staining sections with, 167. 

 Alum solution, 175. 

 Amici prism, 120, 126. 

 Amplifier, 97, 214. 

 Amplification of microscope, 92. 

 Analyzer, 126, 136 ; adjustment and put- 

 ting in position, 136. 



Anastigmatic objective, 196. 



Angle of aperture, 16, 17. 



Angstrom and Stokes' law of absorption 



spectra, 123. 

 Angular aperture, 16, 17. 

 Anisotropic, 137. 

 Apertometer, Abbe's, 212. 

 Aperture of objective, 17-22, 212 ; angu- 

 lar, 16, 17 ; formula for, 17, 18 ; of 

 illuminating cone, 44; numerical, 

 17, 20, 212 ; numerical of condenser, 

 43 ; and optical section, 87 ; signifi- 

 cance of, 20. 

 Aplauatic cone, 44 ; objectives, 12 ; ocu- 

 lar, 23. 

 Apochromatic condenser, 40 ; objectives, 



12, 61, 195. 

 Apparatus and material, 1, 33, 80, 92, 109, 

 120, 140, 183 ; for drawing, 216 ; for 

 photo-micrography, 185, 191. 

 Appearances, interpretation, 80, 91. 

 Aristotype paper, 208. 

 Arrangement of condenser, 45 ; of lamp, 

 bull's eye and microscope, 49 ; mi- 

 nute objects, 180 ; serial sections, 

 169 ; tissue for sections, 168. 

 Artifacts, 81. 

 Artificial illumination, 36, 46, 48 ; for 



photo-micrography, 200. 

 Autograph, photo-micrographic camera, 



190-192. 

 Avoidance of diffusion currents, 162 ; of 



distortion, in. 

 Axial light, 35, 84 ; experiments, 39 ; with 



Abbe illuminator, 46. 

 Axial point, 16; ray, 35. 

 Axis, optic, 2, 3, 11 ; of illuminator, 47 ; 

 secondary, 5, 47. 



Back combination or system of objective, 

 10-13. 



Bacillus tuberculosis, 56. 



Balsam, 175 ; bottle, 164 ; balsam, mount- 

 ing in, 163, 167 ; preparation of, 175 ; 

 removal from lenses, 58; natural, 

 176 ; neutral, 176 ; removal from 

 slides, 141 ; xylene, 175, 176. 



Banded absorption spectra not given by 

 all colored objects, 133. 



Bands, absorption, 123. 



Base, circular, of microscope, 73. 



Bed, camera, 207. 



