INDEX 



283 



Diaphragm, Davis', 181 



lamp, on, 97 



Nosepiece iris, 181 

 - Substage, 28 



Diatoms : Adinoptychus heliopelta, 

 255 



Amphipleura pellucida, 177, 257 



Arctchnoidiscus ehrenberghii, 254 



Development for, 257 



Navicula crabro, 255 



lyra, 255 



rhomboides, 178 



Photomicrography of, 253 



Pleurosigrna angulatum, 256 



Resolution by oblique light, 177 



Surirella gemma, 178, 256 



Test objects, 57, 178, 254 



Triceratumfavus, 255 

 Diffraction effects with bacteria, 240 



and restricted N.A., 121 

 Dispersive power, 49 

 Dissecting microscope, 139 

 Dissections, Photomicrography of, 250 

 Draw tubes, 34 



Drying negatives, 225 

 Dufay colour plates, 210 

 Duplicating colour photography, 211 

 Dust on lenses, 144 

 Dyes for three-colour process, 207, 

 273 



Ehrlich's hiematoxylin, 261, 265 

 Ellipsoid en larger, 129 

 Embryo chick, 260 

 Enlargement table, 275 

 Enlargements compared to high- 



power photos, 230 

 Enlarging, 230 



with photomicrographic appara- 

 tus, 231 



with reflecting apparatus, 232 

 Eosin, 266 



Equivalent focal length, and lens, 59 

 Ernemann's microcinematograph, 189 

 Ether saturator, 95 

 Exposure, 147, 169 



Exposure, diatoms, for, 257 



Errors in, 226, 257 



factors, 171 



of "M" Screens, 174 



and immersion objectives, 69 



and light source, 173 



and magnification, 173 



andN.A., 172 



notebook, 170 



Over-, 226 



Record of, 171 



Trial-, 169 



Under-, 226 



Unit of, 175 



Extension of camera and magnifica- 

 tion, 77, 131 



Extra bellows, 9 

 Eyepiece, Achromatic, 74 



Compensating, 55, 72 



Demonstration, 73, 247 



Designation of, 74 



Holoscopic, 74 



Huyghenian, 72 



objective, and, 74 



Power of, 76 



limit, 74, 76 



Projection, 72, 152 



Factorial development, 224 

 False images and diffraction, 245 



and oblique light, 254 



Farmer's reducer, 271 

 Fermentation industries and photo- 

 micrography, 243 

 Ferrotype, plate polish for, 276 

 Films, 219 



Filters, Light. (See Colour Screens 

 Fine adjustment, 32-34 



Lever, 33 



Prismatic bar, 32 



Rapidity of, 32 



Safety, 34 



testing, 33 



Substage, 28, 39 



Fixing plates, 224 



reagents, 258 



