INDEX. 



237 



Vertical camera, 1S8, 190, 192, 193, 202, 

 207 



Vials for preparation 159 



Virtual image, 5, 6, 10, 31 ; standard dis- 

 tance at which measured, 97. 



Virion, double or binocular, 92, 93. 



Ward's e}'e 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, 129 ; scale 

 of, 128. 



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



Wollaston's camera lucida, 95, 11 1. 



Wor.k-room for photo-micrography, 187. 



Work-table, position, etc., 59. 

 1 Working distance of microscope or ob- 

 jective, 11, 33 ; determination of, 38 ; 

 oculars, 25. 



Writing diamond, 173. 



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



Xylol, German form of xylene, 159, 176. 



