IXDEX 



313 



Refractive indices, 101 



table of, 102 

 Research, methods of, 214 

 Resokitiou, of dark-field condensers, 

 203 



of diatoms, 261 



limit of, 100 



losses in, 1 



with marginal rays, 248 

 Rhoeo discolor, chromosomes, 227 

 Ring test, 89, 250 

 Rohr, von, binoculars, 213 



monochromatic objective, 202 



orthomorphy, 43 

 Ross, correction collar, 198 

 Routine microscope, practical points, 

 64 



work, choosing objectives for, 125 



S 



Schmidt, cover-glass problem, 112 



water-immersion, 131 

 Screen before eyepieces, 54, 56 

 Screens, color, 75 



practical points, 79 



green, for aspheric condenser, 85 



for intensity of Hght, 78 



neutral, 78 

 Sea urchin, larva, 240 

 Secale, fracture of chromosome, 228 

 Sections, paraffin, method, 241 

 Semisterility in crosses, 230 

 Separation, limits of, 120 

 Siedentopf, binocular attachment, 

 52, 143, 203 



papers on dark field, 212 



l^hotographic attachment, 143, 

 166, 203 



resolution with dark field, 203 



star test, 122 



test for objective, 172 



ultramicroscope, 132 

 Sine law, 80, 86 

 Slide bar, 206 



Detto, 50, 206 

 Slides, care of, 177 



reflections in, 68 



thickness, 251 



Source of light, 28 



diaphragm on, 3, 208 



ground glass, 69 



large, and glare, 247 



original, 67 

 Source-field, 28 



and source, 68 

 Spectacle magnifiers, 22 

 Spectacles, distance, with binoc- 

 ular, 45 

 with monocular, 59 

 with parallel tubes, 51, 54 



with magnifiers, 25 



reading, and distance, 25 

 with binocular, 45 

 with converging tubes, 54 

 Spencer Lens Co., Abbe camera 

 with half-silvered cube, 162 



achromatic condenser, 201 



booklet of instructions, 209 



eyepieces, 148 



Greenough binocular, 190 



half-silvered cube, in camera, 208 

 in vertical illuminator, 208 



water-immersion objective, 119 

 Spirochsetes, observed alive, 232 

 Spitta, book on microscope, 210 



front lens of immersion objectives, 

 180 



green filters, 11 



illumination, 67 



semi-apochromatic, 200 



Wratten filters, 203 

 Stage, 138 



mechanical, care of, 180 



practical points, 145 



summary, 144 

 Stain, iron-acetocarmine, 242 



iron-brazilin, 243 



iron-hsematoxyhn, 246 

 Staphylococcus, dark field, 234 

 Star test, for objectives, 111, 172, 



173, 257 

 Starfish, larva, 240 

 Steinheil triplets, 18 

 Stizolobium, semisterile hybrid, 230 

 Streptococcus, dark field, 234 

 Styrax as mounting medium, 104 



