140 ELEMENTARY PHOTO -MICROGRAPHY. 



LIST OF PLATES. 



COLOURED PLATES. Facing Page 



I. FRONTISPIECE : Polariscope effects . . Title 

 II. ,, Multiple colour illumination 66 



HALF-TONE ILLUSTRATIONS. 

 I. TAKEN WITHOUT A MICROSCOPE 



Shell 12 



Magpie Moth . . . . . . . . 12 



II. TAKEN BY DIRECT LIGHT 



Section of human tongue . . . . 22 



Clematis . . . . . . . . 22 



III. Wing of gnat 38 



Heliopelta 38 



IV. Radula of snail . . . . . . 50 



TAKEN BY REFLECTED LIGHT 



IV. Eggs of magpie moth . . . . 50 



V. Eggs of pheasant's parasite . . . 52 



Pollen of mallow . . . . . . 52 



VI. Foraminifera . . . . . . . . 58 



Polycystina . . . . . . . . 58 



VII. Eggs of peacock's parasite . . . . 62 



DARK-GROUND ILLUMINATION 



VIII. Echinus spine 68 



Echinus spine . . . . . . . . 68 



IX. Diatoms . . . . . . . . 74 



Barnacle cirri . . . . . . . . 74 



X. Campanularia . . . . . . . . 82 



XI. FLASHLIGHT . . . . . . . . . . 90 



XII. POLARISCOPE 



Brucine . . . . . . . . 100 



Sulphate of copper . . . . . . 100 



XIII. OBLIQUE ILLUMINATION 



Navicula lyra . . . . . . . . 108 



Surirella gemma . . . . . . 108 



XIV. ^ OIL IMMERSION 



Bacteria .. .. .. .. 118 



Coscinodiscus asteromphalus .. 118 



XV. Amphipleura pellucida . . . . 130 



DOUBLE LIGHTING 



XV. Crystals of sal-ammoniac . . . . 130 



