INDEX 



299 



Tray for slides, 187. 



Triplet, aplanatic, 7. 



Tripod, 7, 104 ; base for microscope, 86 ; 

 as focusing glass, 209. 



Tube of microscope, Frontispiece. 



Tube-length, 13, 14,56, for cover-glass 

 adjustment, 56, 57 ; importance of, 

 56 ; microscopical, 13, 14 ; of various 

 opticians, table, 14 ; and optical com- 

 binations, 11S. 



Turn-table, 168. 



U— V— W— X 



Unadjustable objectives, 12. 



Under-correction, 5. 



Unit of measures, in micrometry, 112 ; of 

 wave length, 143. 



Valuation of ocular micrometer, 114-116 ; 

 table, in. 



Variable objective, 13. 



Varying magnification of compound mi- 

 croscope, 109. 



Varving ocular micrometer valuation, 

 118. 



Velocity under microscope, 98. 



Vertical, camera, 205-210, 225 : illumina- 

 tor, 13, 238-239. 



Vials, preparation, 174 ; blocks for, 174. 



Virtual image, 5, 6, 9, 32 ; standard dis- 

 tance at which measured, 109. 



Visibility with objectives, 20. 



Vision, double, 103, 105 ; microscopic, 21. 



Washing apparatus for tissues, 280. 



Waste bowl, 181. 



Water immersion objective, 16-19, 56; 

 light utilized, 17 ; numerical aper- 

 ture, 19 



Water, bath, 235, 255 ; for immersion ob- 

 jectives and removal of, 56, 58. 



Wave length, designation of, 143 ; scale 

 of, 142. 



Wax models, 274. 



Weights and measures, see 2d page of 

 cover. 



Welsbach light, 37, 229. 



Wollaston's camera lucida, 107, 125. 



Work-room for photo-micrography, 224. 



Work-table, position, etc., 62. 



Working distance of microscope or ob- 

 jective, 11, 34, 39-40. 



Writing diamond, 196. 



Xylene, 178, 200 ; balsam, 199 ; for re- 

 moving oil, 179 ; removing from 

 slides, 189. 



Xylol, German form of xylene, 178, 200. 



