INDEX. 



229 



44 ; numerical aperture of, 43-44 ; 

 optic axis of, 41, 45 ; for photo mi- 

 crography, 40, 191, 201 ; substage, 39. 

 40. See also illuminator. 



Condensing lens, 35. 



Cone, aplanatic, 44 ; illuminating, 43. 



Conjugate foci, 3. 



Construction of images, geometrical, 5. 



Continuous spectrum, 123. 



Contoured, doubly, 87. 



Converging lens, 3, 5 ; lens-system, 10. 



Convex lenses, 3, 5. 



Corn sLarck, examination of, 90. 

 ^Correction, chromatic, or color, 13, 210 ; 

 cover-glass, 15, 52-53 ; cover, tube- 

 length for, 53-54; over and under, 



Cost of microscope, 63. 



Cotton, collodion, 176; examination of, 

 90; gun, 176; soluble, 176. 



Cover-glass, or covering glass, 141 ; ab- 

 erration by, 1,1 ; adjustment, spe- 

 cific directions, 53 ; adjustment for, 

 in phoo micrography, 201 ; adjust- 

 ment and tube-length, 13, 14, 53 ; 

 anchoring, 150; cleaning, 141, 142; 

 correction, 52, 53 ; effect on rays 

 from object, 52; gauges, 143-145: 

 larger than object. 146 ; measurer, 

 143-145 ; measuring thickness of. 

 143 ; non adjustable objectives, table 

 of thickness 15; No 1, variation of 

 thickness, 143 ; putting on, 84, 146 ; 

 siding, 148, 150; size of, 146 ; thick- 

 ness of, 14, 15, 143, 170; tube-length 

 with, 14, 53, 54; wiping, 142 ; with 

 serial sections, 170. 



Crayons, 216. 



Crystals, biaxial, depolarizing, 138; from 

 frog for pedesis, S9. 



Crystallization under microscope. 183. 



Crystallography, 48, 180 ; list of substan- 

 ces for, 181 



Currents, diffusion, avoidance of, 162 ; 

 in liquids, 88. 



Cutting sections, 160, 166. 



D 



Dammar, for fixing crayon drawings, 

 216 ; removal from lenses, 58 



Dark-ground illumination, 36, 47, 4S ; 

 with Abbe illuminator, 4S ; wiih 

 mirror. 48 



Davlight, lighting with, 34. 



Defining power, 21. 



Dehydration, 157, 162, 167. 



Demonstration microscope, 77. 



Depolarizing crystals, 138. 



Designation of oculars, 26 ; of wave 

 length, 129. 



Determination of field of microscope, 29 ; 

 magnification, 92, 94, 214; of sedi- 

 ment in water, 180; of working dis- 

 tance, 38. 



Developers for photo-micrography, 197. 



Development of negative, 196. 



Diagrams with photographic objectives, 

 208; preparation of, 215. 



Diamond, writing, 173. 



Diaphragms and their employment, 35, 

 44 ; central stop, 36, 47 ; eccentric, 

 42, 48 ; iris, 40 ; ocular, 28 ; pin-hole, 

 4 1 , 45, ; size and position of opening, 

 35, 44 ; with condenser, 44. 



Diffraction, grating, 122 ; illusory ap- 

 pearances due to, 91. 



Diffusion currents, avoidance of, 162. 



Direct, light, 34; vision spectroscope, 

 120. 



Dispersing prism, 122. 



Displacements, in mounting objects in 

 resinous media, 153. 



Dissecting microscope, 9. 



Dissociator, formaldehyde, 377 ; nitric 

 acid, 179. 



Distance, principal focal, 3, 30 ; standard 

 at which the virtual image is meas- 

 ured, 97 ; working d. of simple mi- 

 croscope or objective, 38 ; working 

 d. of compound microscope, 11, 33, 



Distinctness of outline, 85. 



Distortion in eft-awing, avoidance of, III. 



Diverging lens, 3. 



Dividers, measuring spread of, 93. 



Double spectrum, 128 ; vision, 92, 93. 



Doubly contoured, 87 ; refracting, 137. 



Dravv-iube, Frontispiece; pushingin, 37. 



Drawing, with Abbe camera lucida, 114- 

 115 ; board for Abbe camera lucida, 

 115-1 16 ; distortion avoidance of, 1 11; 

 embryograph for, 119; with micro- 

 scope, 109; photographic camera 

 for, 119 ; for photo engraving, 216 ; 

 scale and enlargement of, 118 ; tran- 

 ferring, 217. 



Dry objectives, 11, 17-19; for laboratory 

 microscope, 61 ; light utilized, 18 ; 

 dry mounting, 147 ; numerical aper- 

 ture, 18 ; dry plates, discovery by 

 Maddox, 1S4. 



Drying negatives, rack for, 203. 



Dust, of living rooms, examination of, 

 90 ; on objectives and oculars, how 

 to determine. 82 ; removal, 58. 



Dye, general, staining with, 167 ; aque- 

 ous, i6r, 167 ; alcoholic, 161, 167. 



