PLATE V 



[The negatives and reproductions are untouched) 



Fig. 1. Example of CtQture-Tube Photography. B. Tuberculosis Hominis 

 Glycerine-Glucose-Agar culture. 



Fig. 2. Example of Culture- Tube Photography. Sp. Cholera A siatica. 96 hours 

 growth. Gelatin stab culture. 



Fig. 3. Example of Culture-Tube Photography. B. Coli Communis. Stab 

 culture in Glucose-Gelatin, Gas Bubble-tube. '■ 



Fig. 4. Example of Culture-Tube Photography. Streptococcus Pyogenes. Gelatin 

 streak culture. 



Fig. 5. Example of Diatoms Photographed with dark ground Illumination. 



Effect produced by use of Wenham's Paraboloid. The specimen is really 

 mounted transparently, but the dark-ground effect is produced entirely by the 

 paraboloid. 



Fig. 6. Example of Photography with Opaque-mounted Objects. A group of 

 Polycistina. Photograph obtained by use of a Lieberkuhn placed over a 

 "Planar" 50 mm. lens. The light is thrown on to the Lieberkuhn from 

 behind the specimen, through those parts not "stopped out" by the dark 

 background. 



Fig. 7. Example of Photography of a Flagellated Bacterium. Flagellated 

 Typhosus, a faint specimen stained by Loffler's method, well contrasted by 

 deep green glass. Powell & Lealand's N. A. 1-43, their dry apo. 

 N. A. i-o condenser, and Zeiss projection ocular 6, A large cone of light. 



1000 



Fig. 8. Example of Photography of a large type of Spirillum. A red well- 

 stained specimen of Spirillum Rubrum, a green contrast glass. Optical 

 arrangements as in Fig. 7. x 1000 



Fig. 9. Example of Photography of the Coecoid form of Bacteria. Large 

 micrococcus (air) stained red, green contrast glass, Optical arrangements 

 as in Fig. 7. x 1000 



Fig. 10. Example of iPhotography of the Bacillus form of Bacteria. Bubonic 

 plague in a rat. Stained red. Optical arrangements as in Fig. 7. x 1000 



Fig. II. Example of Tissue Photography where somewhat thick sections 



are unavoidable. Human retina. Zeiss | inch apo. and green contrast 



glass, Zeiss achromatic condenser, N. A. i-o, and projection ocular 6. Stained 



with logwood. A reduced cone of light to avoid " flooding," but not enough 



to produce diffraction effects. x 200 



• 



Fig. 12. Example of Diatom Photography where the Specimen is sensibly 

 thick. Navicula spectabilis. Reduced cone of light to gain depth of focus, 

 Zeiss apo. ^ N. A. 1-40, and 6 projection ocular. Powell & Lealand dry 

 apo. condenser, N.A, ro. White light. x 750 



