INDEX 



ABBE, PROF., test-plate, 29, 32, 221 ; 

 apochromatic objective, 40 ; con- 

 denser, 47, 167 ; on advantage of 

 powerful light, 76 ; law for resolu- 

 tion, 215 ; apertometer, 307 



Ab oration, vide Chromatic, Spherical 



Absorption spectra of colour-screens, 

 205, 210-218; atlas of, 218 



Acetate of copper, 212, 291, 294 



Acetylene, 78, 169; lamps for, 79; 

 generators for, 79 ; dissolved, 80 ; 

 heat from, 79 ; actinic value of, 226 



Acetylene Tlluminating Co., 80 



Achromatic, condensers, vide Sub- 

 stage condensers ; objectives, vide 

 Objectives 



Acid-green, 213, 292, 302 



Actinic values of illuminants, 78, 79, 

 226 ; comparison by exposure- 

 meter, 225 



Actinomycosis bovis, 295 



Agar-solutions, 255, 268, 271 



Allochrome plates, 288 



* Alloys ' by E. F. Laws, 265 



Alloys, tin and antimony, 303, silver 

 and copper, 304 



Alum solution, 180 ; refractive index, 

 306 



Amidol, 230, 240, 243, 288 



Ammeter, 105 



Amphipleura pellucida, 29, 301, 303 



Anastigmat lens, 34 



Angular aperture, 25 



Angus, H. F. & Co., 17, 292 



Aniline dyes for colour-screens, 211- 

 214 ; with gelatin plates, 219 



Annular illumination, 53, 167 



Antipoints, 51 



Apertometers, Abbe, 307 ; Cheshire, 

 309 



Aplanatic cone, size of, 47-49, 53 ; 

 advantage of large, 166, 167 



Apochromatic, condensers, 50, 51, 

 300 ; objectives, vide Objectives 



Arc light, 95 ; carbons for, 96-98 ; 

 current-consumption, 99 : con- 

 nections for, 104 ; protection 

 of eyes from, 154 ; heat from, 

 180 ; actinic value of, 226 

 hand-feed, 99, 101, 102, Author's 

 type, 101, Leitz, 106, 165, ad- 

 justments of, 102, 103 ; auto- 

 matic, Zeiss, 103, Leitz, 103 

 for instantaneous photo, 140 ; 

 with sub-stage condenser, 168 



Auramin, 289, 296, 298 



Aurantia, 200, 211 



Axial illumination, 28, 30 



BACILLUS, anthracis, 290, 291, 297 ; 

 coli communis, 271, 290 ; of diph- 

 theria (Krebs-Loffler), 271 ; fila- 

 mentosus, 29 ; of leprosy, 299 ; 

 pestis (Bubonic plague), 296 ; of 

 tetanus, 271 ; tuberculosis, 29, 271, 

 296 : typhosus, 299 



Backing of plates, 220, 221 



Backlash, 6 



Bacteria, tube (stab or streak) cultures, 

 268, 271, 272 ; plate-cultures with 

 transparent or opaque colonies, 270 : 

 gelatin-cultures, 268, effect of tem- 

 perature on, 272 ; apparatus for 

 photographing, 267, 269, 273 ; il- 

 lumination of, 57, 117, 139, 268, 

 271; water-bath to avoid reflection, 

 24, 268 ; objectives for, 33, 162, as 

 tests for objectives, 29 ; focussing 

 of, 156, 191 ; instantaneous photos 

 of, 139 ; to reproduce natural size, 

 273 ; pathological specimens, 273 



Baker, C., microscope stand, 14; 

 mercury-vapour lamp, 93, with 

 quartz tubes, 94 ; Dr. E. J. Spitta's 

 monochromatic apparatus, 215 ; 

 circular stops for stereoscopic work, 

 275; Cheshire apertometer, 309 



