288 



INDEX 



Oil immersion objectives, 67 

 and brightness of image, 



69 

 compared to dry objectives, 



69 



cover-glass correction, 70 



Exposure with, 69 

 Oil lamps, 99 



Opaque objects, Photography of, 191 

 Optical bench, 2 



Beck's, 148 



Geometric slide, 19 



made of bicycle tubing, 199 



Zeiss' large, 150 



Zeiss' triangular bar, 200 



- flats, Coloured, 155 



lantern, 8 



- tube length, 76 

 Orange G., 266 

 Orthochromatic plates, 166, 215 



Paget colour plates, 210 



duplicating colour, 211 

 Panchromatic plates, 166, 214 

 Parabolic reflector, 192, 199 

 Paraboloid, Wenham, 179 



- Watson's, 184 



Zeiss', 184 



Parachromatic condenser, 109 

 Paraffin wax for imbedding, 259 

 Paragon condenser, 109 



- plates, 220 



Paralleliser, Adjustment of, 147 

 Parallel light, Illumination with, 147 

 Parasites, Photography of, 252 

 Penetration, 63 



immersion of object, and, 250 



iris diaphragm, and, 64 



N.A., and, 64 



refractive index of medium, and, 

 64 



Perenyi's fluid, 263 

 Perfectol lamp, 98 

 Persulphate reducer, 271 

 Petrol vapour lamp, 98 

 Petrology, 189 



Photomicrography, Applications of, 

 238 



evidence, as, 2 



adulteration, and, 238 



Medical practice, and, 239 



research, and, 2 



(See also under individual subjects) 

 Photomicrographic apparatus, Sets 



of, 277 



Picric Acid, 266 

 Planars, 79 



Illumination for, 136 

 Plant sections, 257 

 Plate Cultures, 246 

 Plates, Autochrome, 210 



Backed, 219 



- Chromo-Isolar, 220 



Colour sensitive, 165 



Dufay, 210 



Gem Tricol, 214 



Grain of, 216 



- Hydra, 214 



- II ford panchromatic, 214 



Lippmann, 216 



Paget Colour, 210, 212 



- Panchromatic, 214 



Panchromatic, 166, 214 



Paragon, 220 



Resolring power of, 216 



Sanger-Shepherd, 214 



- Speeds, 215 



- Wratten and Wainwright's " M " 

 and Panchromatic, 214 



Platinotype, 229 



developer. 272 

 Pleurosigma angulatum, 256 

 Polarised light, 189 



Pole paper, 89 



Polish for ferrotype plates, 275 

 Polyzoa, 249 

 Pond life, 247 

 P.O. P., 228 



Powell and Lealand Apochromatic 

 Condenser, 110 



Objective, 67 



Premier microscope, 37 



