INDEX 



821 



Ross, Messrs., horizontal camera, 123 



Royal microscope, 14 



Royal Microscopical Society's Journal, 



26, 224, 311 

 Ruby lamp for dark-room, 198 



SANGER, SHEPHERD & Co., green colour 

 screens, 199 ; process for coloured 

 lantern-slides, 277-279 



Sarsaparilla, stem of, 286 



Saturator method for acetylene light, 

 84 



Scalp, human, 287 



Screen, yellow, to absorb heat, 180 



Searcher eye-piece, 251, 254 



Semi-apochromatic objectives, 20, 42 



Sensitive plates, gelatin dry, 218, 

 219 ; dry collodion emulsion, 218 ; 

 wet collodion, 218, for lantern- 

 slides, 245. isochromatic, 200, 219, 

 220, Edward's, 220, Lumiere, 220, 

 Isolar, 200, 221, Wratten and 

 Wainwright's, 220 ; orthochromatic, 

 200, Wellington's, 220, llford, 220, 

 Barnet, 220; panchromatic, 219, 220; 

 backing of, 220 : degree of sensi- 

 tiveness, 75; grain of, 218, 219, 

 245 ; size of, 181 ; for ultra-violet 

 light, 222, 225 



Sensi tempters, 222, 223 



Siedentopf, ultramicroscopic method 

 of, 59 



Sliding: objective-changers, 32; Zeiss, 

 36, 151 



Sodium sulphite, 240, 241, 243 



Sorby parabolic reflector. 64 



Spectacle lenses for focussing, 187 



Spectra from acetylene lamp, 79 ; 

 from mercury-vapour lamp, 92, 

 214; from 'Welsbach gas, 78; 

 from colour-screens. 210-214 



Spectroscope, 200, 210, 213, 216 



Speculum with arc light, 108 



Spherical aberration of objective, 

 21, 29. 30; of condenser, 48 



Spirorhcete pallida, 298 



Spitta, Dr. E. J., monochromatic 

 apparatus, 215 ; works by, 310 



Spot lens, 53 



Stab cultures of bacteria, 268 



Stage of microscope, 7, 8 



Staining of specimens, 216, 235, 286- 

 288, 292, 294, 295 



Stead, J. E., 265, 264 



Steel-spring supports for camera, 177 



Stereoscopic photo - micrography, 

 three methods, 274, 275; illu- 

 mination for, 276 



Stoney, Dr. G. Johnston, heliostat 



109 



Stopping down of objective, 23, 59 

 Streak cultures of bacteria, 268 

 Streptococcus pyogenes, 298 

 Styrax, 24 ; refractive index of, 



306 



Sub-stage condensers, centreing, 8, 

 160 ; chromatic, 46, 49, 167 ; 

 achromatic, 49, 52, 161, 166, 

 168, Swift, 50, Leitz, 50; 

 apochromatic, 50, 51, 300 ; 

 dry, 49, 161 ; oil-immersion, 

 49, 55, 56, 161, Swift, 50, 

 Leitz, 50; Mirror, 47; Abbe 

 illuminator, 47, 1 67 ; para- 

 boloidal (Zeiss), 57 ; objective 

 used as condenser, 50 ; Leitz, 

 dark-ground, 59 ; Watson & 

 Sons', 53 ; Zeiss centreing- 

 collar, 50 



aplanatic cone of, 47, 63, advan- 

 tage of large, 166, 167 ; 

 central stop in, 49, 54, 55, 168 ; 

 centreing of, 161, 163-166 ; 

 numerical aperture of, 46, 47, 

 52, 161 ; reduction of aperture, 

 22, 49, 51, 296, 297, 299; 

 effective working aperture, 52, 

 167, as affected by auxiliary 

 collecting-lens, 173 ; for dark- 

 ground illumination, 53-55 

 Sunlight, 108; Stoney 's heliostat, 



109, substitute for, 109 

 Swift, J. & Son, cameras, vertical, 

 113, horizontal, 121, large photo- 

 micrographic, 129 ; condenser, ; 

 focussing eye-piece, 187 ; mercury- 

 vapour lamp, 94 ; microscope, 

 Wales, 9, Research, 14 ; nose- 

 piece, 36 ; ocular, Universal, 42 



TABLOID, Burroughs Wellcome, de- 

 veloper, 234 

 Tartrazine, 211, 213, 289, 292. 293, 



298 



Taverner, H., 275 

 Temperature, changes of, 175 

 Thames colour plates, 277, 280-282 

 Thickness of cover- glass, vide Cover- 

 glass ; of object-slide, 58 

 Thomas's lantern- plate, 286 

 Thorn & Hoddle Co., acetylene 



generator, 80 



Tongue, cow's, 295; human. 288 

 Toning, 238 ; in lantern-slide making, 



248 

 Tripanosoma gambiense, 292, 293 



