154 INDEX 



PAGE 



Powell and Lealand's Apochromat A Horn 71 



Printing-frames no 



Printing Methods 98 



Projection Oculars 12 



Pyrogallol 32 



Rack for Drying Negatives 31 



Reade, Rev. J. B. Early Photo-micrographs of 4 



Recording Amplifications 136 



Reducer, "Agfa" 131 



Reducer, Farmer's 101, 130 



Reducer, Persulphate Ammonium 130 



Restraining Development 133 



Revolving-Disc Paper- Cutter 103 



Rives' Photographic Paper 108 



Ross' Achromatic Condenser 69 



Rubber Squeegee 107 



Seymour's Device for Instantaneous Exposures 18 



Screens for Focusing 55 



Spencer Lens Company's Microscopes . . . n, 14, 50, 53, 87 



Squeegeeing Prints 106 



Stage Micrometer 137 



Staining Bacteria 82 



Storing Negatives and Plates 35, 122 



Substage Condenser 66, 69 



Sunlight as the Radiant 42 



The Acetylene Light as Radiant 44 



The Coal-oil Lamp as Radiant 46 



The " Continental " form of Microscope . 10 



The Dark-room 27 



The Electric- arc as Radiant 43 



The Lime- light as Radiant 44 



The Radiant and Illumination 42 



The Wellsbach Incandescent Mantle as Radiant 45 



The Three-legged Focusing Microscope . 13, 57 



Utilizing Spoiled Lantern Plates 114 



Varnishing Lantern Slides 114 



