INDEX. 



95 



apochromatic, 4 ; back combination 

 of, 3 ; cleaning back lens of, 27 ; col- 

 lar, graduated for adjustment, 23 ; 

 compound, 7 ; cloudiness or dust, 

 how to determine, 30 ; dry, 4 ; equiv- 

 alent focus of, 3 ; focusing for micro- 

 spectroscope, 59 ; front combination 

 of, 3 ; function of, 12, 13 ; high, focus- 

 ing with, iS; homogeneous immer- 

 sion, 4 ; homogeneous immersion, 

 cleaning, 25 ; homogeneous immer- 

 sion, experiments, 22, 24 ; immersion, 

 4 ; index of refraction of medium in 

 front of, 7 ; inverted, real image of, 

 13 ; for laboratory microscope, 27, 

 28 ; lettering, 3 ; of low and medi- 

 um power, 4 ; low, focusing with, 

 17 ; micrometer, 37 ; to use with 

 micro-polariscope, 63 ; microscopic, 

 3 ; to use with micro-spectroscope, 

 59 ; for micro-spectroscope, focus- 

 ing) 59 ; nomenclature of, 3 ; non- 

 achromatic, 4 ; non-adjustable, 5 ; 

 non-adjustable, thickness of cover- 

 glass for, table, 6 ; numbering, 3 ; 

 oil-immersion, 4 ; putting in position 

 and removing, 10 ; single-lens, 7 ; 

 terminology of, 3 ; unadjustable, 5 ; 

 water immersion, 24 ; water immer- 

 sion, experiments, 22 ; working dis- 

 tance of, 15. 



Oblique light, 16 ; with Abbe illuminat- 

 or, 20 ; experiments, 19 ; with a mir- 

 ror, 19. 



Ocular, 1 ; achromatic, 8 ; aplanatic, 8 ; 

 binocular, 8 ; cloudiness, how to de- 

 termine, 29 ; Campani's, 8 ; compen- 

 sating, 4, 9 ; compound, 8 ; deep, 8 ; 

 designation by magnification or com- 

 bined magnification and equivalent 

 focus, 10 ; dust, how to determine, 

 29; equivalent focus of, 10; erect- 

 ing, 8 ; eye-point of, demonstration, 

 14 ; field-lens, 8 ; focus, equivalent 

 of, 10 ; function of, 13, 14 ; goniom- 

 eter, 9 ; high, 5, 9 ; holosteric, 9 ; 

 Huygenian, 9 ; Kellner's, 9 ; letter- 

 ing of, 10 ; low, 9 ; micrometer, 9, 

 10, 42, 43 ; micrometer, micrometry 

 with, 44 ; micrometer, putting in po- 

 sition, 43 ; micrometer, valuation of, 

 43 ; micrometer, varying valuation, 

 44 ; micrometer, ways of using, 45 ; 

 micrometric, 9 ; microscopic, 8, 9 ; 

 negative, 8, 9 ; numbering, 10 ; or- 

 thoscopic, 9, 12 ; par-focal, 18 ; peri- 

 scopic, 9, 12 ; positive, 8, 9; projec- 

 tion, 9 ; projection, designation of, 

 10 ; putting in position and remov- 

 ing, 10 ; Ramsden's, 9 ; searching, 9 ; 

 shallow, 9 ; solid, 9 ; spectral, 9, 10, 

 54 ; spectroscopic, 9, 10, 54 ; stereo- 

 scopic, 8 ; working, 9. 



Oil and air, appearances and distinguish- 

 ing optically, 31, 32. 



Oil-globules, with central illumination, 

 31 ; with oblique illumination, 31, 32. 



Oil-immersion objectives, 4. 



Optic axis, 6 ; of condenser, or illumina- 

 tor, 20 ; of microscope, 16. 



Optical, combination, 1 ; focus, 4 ; parts, 

 1 ; parts of compound microscope, 

 3 ; parts of microscope, care of, 26 ; 

 section, 33. 



Order of procedure in mounting objects, 

 dry or in air, 73 ; in Farrant's solu- 

 tion, 74; in glycerin, 73 ; in glycer- 

 in jelly, 74 ; in resinous media by 

 desiccation, 76 ; in resinous media by 

 successive displacements, 76. 



Ordinary ray with polarizer, 63. 



Orthoscopic ocular, field with, 12. 



Outline, distinctness of, 32. 



Oxy-hsemoglobin, 61. 



Paper, bibulous, filter or Japanese, 12 

 13 ; for cleaning oculars and obj ect 

 ives, 26. 



Paraffin, removal from lenses, 27. 



Parfocal oculars, 18. 



Parts, optical and mechanical of micro- 

 scope, 1. 



Pedesis, 34 ; compared with currents, 34 ; 

 with polarizing microscope, 34 ; 

 proof of reality, 35. 



Periscopic ocular, field with, 12. 



Permanganate of potash, absorption 

 spectrum of, 60. 



Pin-hole diaphragm, 20. 



Photography, 4. 



Plane mirror, use of, 17. 



Pleochromism, 64, 65. 



Pleurasigma angulatum, 19. 



Point, axial, 6. 



Polarized light, 63 ; extraordinary and 

 ordinary ray of, 63. 



Polarizer, 62 ; and analyzer, putting in 

 position, 63. 



Polarizing microscope, pedesis with, 34. 



Position of objects or parts of same ob- 

 ject, 30. 



Positive oculars, 8, 9. 



Potato, examination of, 35. 



Power of microscope, 36. 



Preparation of Canada balsam, Farrant's 

 solution, glycerin, glycerin jelly, 

 82. 



Preparation of clearing mixture, liquid 

 gelatin and shellac cement, 83. 



Presbyopia, effect on magnification, 40. 



Price of American and foreign micro- 

 scope, 28. 



Principal focus, 1, 2, 3 ; focal distance, 3 ; 

 point, 2. 



