ELEMENTARY PHOTO-MICROGRAPHY. 103 

 LIST OF PLATES. 



Facing 

 page. 



1. Taken without a microscope. 



Dragon fly . . . . . . . . . . 10 



Fantail fly 10 



2. Taken by direct light. 



Section of human tongue . . . . . . 22 



Clematis 22 



3,' Wing of gnat . . . . . . . . . . 36 



Heliopelta 36 



4. Taken by reflected light. 



Parasites' eggs on pheasant . . . . . . 44 



Pollen of mallow . . . . . . . . 44 



5. Foraminifera . . . . . . . . . . 48 



Polycystina . . . . . . . . . . 48 



6. Dark ground illumination. 



Echinus spine . . . . . . . . . . 54 



Echinus spine . . . . . . . . . . 54 



7. Group of diatoms . . . . . . . . 58 



Sponge spicules . . . . . . . . 58 



8. Polariscope. 



Brucine . . . . . . . . . . . . 66 



Sulphate of copper . . . . . . . . 66 



9. Oblique illumination. 



Navicula lyra . . . . . . . . . . 76 



Surirella gemma . . . . . . . . 76 



10. i^in. oil-immersion. 



Bacteria. Bacillus subtilis 82 



Secondary markings . . . . . . . . 82 



Coscinodiscus asteromphalus . . . . . . 82 



n. Crystals of sal-ammoniac by double lighting 92 



Multiple images . . . . , . . . 92 



