92 



INDEX. 



Clearer, clearing, 75. 



Clearing mixture, preparation of, 83. 



Clothes moth, examination of scales, 35. 



Cloudiness, of objective and ocular, how 

 to determine, 29, 30 ; removal, 26. 



Coarse adjustment of microscope, 12. 



Collective, 9. 



Collodion for coating glass rod, 33. 



Color images, 22, 25 ; law of, 55. 



Colored minerals, absorption spectra of, 

 62 ; substances, spectra of, 55. 



Coma, 23. 



Combination of lenses, back and front, 3. 



Comparison prism, 57 ; spectrum, 57. 



Compensating ocular, 4, 9. 



Complementary spectra, 56. 



Compound microscope, see under micro- 

 scope. 



Concave lenses, 4 ; mirror, use of, 17. 



Condenser, 1 ; Abbe, 19 ; optic axis of, 

 20. 



Condensing lens, 20. 



Continuous spectrum, 54. 



Contoured, doubly, 33. 



Converging lens, 1, 3; lens-system, 3. 



Convex lenses, 4. 



Corn starch, examination of, 35. 



Correction, chromatic, 4. 



Cotton, examination of, 35. 



Cover-glass, or covering glass, 67 ; ad- 

 justment, specific directions, 23 ; ad- 

 justment and tube length, 24 ; clean- 

 ing, 67, 68; larger than object, 67; 

 measurer, 69 ; measuring thickness 

 of, 6S ; non-adjustable objectives, 

 table of thickness, 6; No. 1, varia- 

 tion of thickness, 68 ; putting on, 

 74 ; sealing, 71-72 ; tester, 69 ; thick- 

 ness of, 5 ; wiping, 67. 



Currents in liquids, 34. 



Crystals from frog for pedesis, 35. 



Crystallization under microscope, 22. 



Crystallography, 84 ; list of substances 

 for, 84. 



D 



Damar, removal from lenses, 27. 



Dark-ground illumination with Abbe il- 

 luminator, 21 ; with mirror, 21. 



Dehydration, 75. 



Desiccation in mounting objects in resin- 

 ous media, 73, 76. 



Designation of oculars, 10. 



Determination of magnification, 3S. 



Diaphragms and their employment, 16 ; 

 effect of one too small, 30 ; iris, 16 ; 

 ocular, 12; pin-hole, 20; size and 

 position of opening, 16; 



Diffraction grating, 54. 



Direct light, 15 ; vision spectro-scope, 54. 



Dispersing prism, 54. 



Displacements, in mounting objects in 

 resinous media, 75-76. 



Distance, standard at which the virtual 

 image is measured, 39 ; working d. 

 of simple microscope or objective, 

 15 ; working d. of compound micro- 

 scope, 15. 



Distinctness of outline, 32. 



Distortion in drawing, avoidance of 48 ; 

 spherical, 4. 



Dividers, measuring spread of, 37. 



Double spectrum, 57. 



Doubly contoured, 33. 



Draw-tube, pushing in, 18. 



Drawing with Abbe camera lucida, 51, 

 52 ; distance at which done (250 mm. 

 more or less), 40 ; distortion, avoid- 

 ance of, 48 ; with microscope, 47 ; 

 regulating size of, 52 ; scale and en- 

 largement, 53 ; size of, and magnifi- 

 cation of microscope with Abbe cam- 

 era lucida, 52. 



Dry objectives, 4 ; for laboratory micro- 

 scope, 28. 



Dust of living rooms, examination of, 

 35 ; on objectives and oculars, how 

 to determine, 29, 30 ; removal, 26. 



Erect image, 1. 



Equivalent focal length, 3 ; focus of ob- 

 jectives, 3; focus of oculars, 10. 



Examination of dust of living rooms, 

 bread crumbs, corn starch, fibres of 

 cotton, linen, silk, human and ani- 

 mal hairs, potato, rice, scales of but- 

 terflies and moths, wheat, 35. 



Experiments, Abbe illuminator, 20; 

 with adjustable and immersion ob- 

 jectives, 22-25 ; compound micro- 

 scope, 10 ; homogeneous immersion 

 objective, 24 ; lighting and focusing, 

 17; with micro-spectroscope, 60; 

 with micro-polarizer, 64 ; in mount- 

 ing, 81 ; simple microscope, 2. 



Extraordinary ray of polarized light, 63. 



Eyes, care of, 27 ; effect on magnifica- 

 tion, 40. 



Eye-lens of the ocular, 8, 9. 



Eye-piece, 8 ; micrometer, 42. 



Eye-point, 2 ; of ocular, demonstration, 

 14. 



Eye-shade, Ward's, 27, double, PI. II. 



Farrant's solution, in mounting objects, 

 order of procedure, 74 ; preparation 

 of, 82. 



Feather, examination of, 35. 



Fibers, examination of, 35. 



Field, 2 ; with orthoscopic ocular, 12 ; 

 with periscopic ocular, 12 ; of view 

 with microscope, 11, 36, 47. 



