INDEX. 



237 



Vertical camera, 188, 190, 192, 193, 202, 



207 

 Vials lor preparation 159 



Virtual image, 5, 6. 10, 



standard dis- 



tance at which measured, 97. 



Vision, double or binocular, 92, 93. 



Ward's eye shade, 59. 



Waste bowl, 162. 



Water immersion objective, 17, 19, 55; 

 light utilized, 18; numerical aper- 

 ture, 20 



Water, for immersion objectives, 55 ; re- 

 moval, 58; solid sediment in, 180. 



Wave length, designation of, T29 ; scale 



of, 128. 



Weights and measures, see 2d p. of cover. 



Wollaston's camera lucida, 95, til. 



Work-room for photo-micrograph v, 187. 



Work-table, position, etc., 59. 



Working distance of microscope or ob- 

 jective, 1 1, 33 ; determination of, 38 ; 

 oculars, 25. 



Writing diamond, 173. 



Xylene, 159, 176 ; balsam, 175, 176. 



Xylol, German form of xylene, 159, 176. 



