162 



INDEX 



Printing on Nikko paper, 42 

 " Printing-out " paper, 46 

 Pringle's vertical apparatus, 131 

 Projection eye-pieces, 91, 126 



R 



Rectiltnear lens by Dallmeyer for plioto-micro- 

 graphy, 18 



Reflected light for illuminating objects to be 

 photographed, no 



Refraction of light, 81 



Refractive indices, a table of, 151 



Regulators for cylinders, 9 



Reichert's objectives, 78 



Right and left handed screws to cylinders, 9 



" Ross-Planar " lenses in low-power photo-micro- 

 graphy, 18 



Ross's objectives, 78 

 mixed-gas jet, 5 



model for photo-micrography, 63 

 Ruby lamp for developing, 31 



S 



Screens, contrast, their utility discussed, 1-^5 

 monochromatic, how to make, 145, 146 



Selection of objectives, 77 

 final remarks on, 80 



Sensitised plates for use in photomicrography, 

 19 



Silver prints, 44 



toning of, 44 



faults in, 45 

 Snell's law, 82 



" Spot lens " arrangements by author, 95 



ordinary arrangement, 102 

 Stops for placing under condenser to make 



" annular light," 95 

 Substage condenser, 92-103, 138 



condenser, how to centre, 92, 102, 103, 138 



movable, 77 



Support for camera, (fee, in low-power photo-micro- 

 graphy, special arrangement for, 23-26 

 Surirella gemma, how to photograph, 139 

 Swift's lenses, 78 



model for photo -micrography, 64 



photo-micrographical table, 5 i 



T 



Table for cor.version of British and metric 

 measures, 150 

 of dimensions for author's low-power appa- 

 ratus, 25 



of magnification of different apo-objectives, i t6 

 of names of substances which make good 



polariscope slides, 133 

 of penetrating power of different apochro- 



matic objectives, 129 

 of refractive indices, 151 



showing how different combinations of ob- 

 jectives, eye-pieces, and camera lengths 

 can produce same amplification of object, 

 128 



" Taking the photograph " in low-power photo- 

 micrography, 20 

 Test plate of Zeiss, 84 

 Thinning gelatin plates, 124, 125 

 Thum, diatom mounter, 130 

 Toning silver prints, 44 



u 



Unscrupulous firms supplying oxygen in un- 

 annealed and untested cylinders, dangers 

 of, 8 



Use of bad cylinders, insufiiciently tested, danger 

 of, 8 



of cheap oxygen deprecated, 137 

 V 



Van Heurck's model for microscope, 65 



vertical photo-micrographical apparatus, 56, 



131 



Varnish for wet and dry collodion slides, 40 

 Vertical apparatus by Baker, Beck, Leitz, Reichert, 

 Pringle, 131 

 illuminator by Watson, Powell & Lealand, and 

 Zeiss, 133 



W 



Water bath, how to make, 28 



Watson's mount for auxiliary condenser, 1 04 



phOvO-micrographical table, 52 

 Wenham's paraboloid, 112 

 Wet collodion plates, how made, 39 



