]54 



INDEX. 



Gelatine Emulsion, 80 



Gibbes, Dr., 69 



Glass Slides, 73 



Glass Thin, 73 



Glycerine and Gum, 68, 72 



Gold Trichloride, 63 



Heliostat, 33 



Huyghenian Eyepiece, 24 

 Hyposulphite of Soda, 78 



Immersion Principle, 19 

 Illumination, 82 

 Incandescent Lamp, 38, 95 

 Intensifying, 76, 86 

 Insect Mounting, 57 



Latitude to Find, 36 

 Lamp for Dark Room, 51 

 Lamp, Parafin, 39 

 Lantern Enlarging, 148 

 Lenses, 5 



Magnifying Power, 14 

 Markings on Diatoms, 62 

 Media Mounting, 57, 58 

 Microscope, 25 

 Microtome, 64 

 Mounting Objects, 55 

 Mounting Prints, 139 

 Morgan's Paper, 142 

 Muller's Fluid, 64 



Negative, Properties of, 132 

 Neutral Oxalate, 87 



Oblique Illumination, 109 

 Object Glass, 15 

 Oil Immersion Condenser, 30 

 Opaque Objects Photography, 108 

 Overexposure, 133 



Paper Sensitized, 137 

 Patent Plate Glass, 41 

 Penetration, 16 

 Petzval Portrait Lenses, 143 



Photographing with 1 inch, 100 

 Photographing Objects in Fluid, 



100, 110 

 Photographing with J inch, 110 

 Photographing with J inch, 121 

 Photographing with -,', inch, 125 

 Photographing Horizontally, 118 

 Potash Bichromate, 64 

 Potash Oxalate, 87 

 Principal Focus, 6 

 Printing, 137 



Production of Positives, 137 

 Pure Chemicals, 129 



Radiation, 132 

 Real foci, 6 

 Reflection, 4 

 Refraction, 4 

 Rutherford's Microtome, 64 



Scales of Moths, 55 

 Section Cutting, 64 

 Silver Nitrate, 75 

 Sodium Sulphate, 64 

 Sodium Hyposulphite, 78 

 Spectrum, 11 

 Staining, 67 

 Stage of Microscope, 26 

 Stand for Apparatus, 43 

 Substage, 32 

 Sun Light, 32 

 Swan's Lamp, 111 



Testing Solutions, 37 

 Thin Glass, 73 

 Toning, 138 



Undulatory Theory, 4 



Varnishing, 79 

 Virtual Foci, 6 and 7- 

 Visual and Chemical Foci, 14 



Wet Process, 75 

 Wenham Object Glass, 15 

 Window of Dark Room, 50 



ERRATUM. 



Pages 42 — S3, folio lines, for Hand &c, read Stand. 





Printed by H. K. Lewis, 136 Gower Street London, W.C 



