464 



INDEX 



Oculars, Ramsden's and fig., 24-25 



spectroscopic, 247 



standard sizes, 106 

 Oil and air, distinguishing, I13-114 



cedar- wood, 352 

 Oil-globules, study of, 113 

 Oil immersion objectives, 21, 295, 437 

 Opacities and aperture, 303-304 

 Opaque objects, lighting, 46, 434-435 

 Opaquing negatives, 182 

 Opera glasses, 430 

 Optic axis, 282-284 

 Optical bench, 221 



center, n, 282 



parts of compound microscope, 16- 



27 

 section, 117 

 Optics of the microscope, 270-311 

 Order of procedure in mounting, 323- 



3 2 9 

 in air or dry, 323 

 in balsam, 328-329 

 in glycerin and glycerin jelly, 326- 



3 2 7 

 Ordinary ray with polarizer, 264 

 Organs and tissues, preparation of, 368 

 Orthochromatic plates, 235 

 Outlines, distinctness of, 114 

 Oven for paraffin infiltration, 377 

 Over-correction, 285-288 

 Oxy-hemoglobin spectrum, 260 



Panchromatic photographic plates, 235 

 Paper, bibulous (lens paper), 93 



blotting for models, 413-422 



photographic for prints, 178, 181, 

 232, 234 

 Paraffin, 363, 375-386 



deparaffining, 384 



filtering, 363 



infiltrating with, 376-377 



imbedding in, 377 



imbedding in paraffin and collo- 

 dion, 391-392 



method for sectioning, 375, 386 



oven for infiltrating, 376 



removing from sections, 384 



sections, spreading, 382-384 

 wax, 363 

 Parfocal objectives and oculars, 38-39, 



309 

 Parfocalization, 38-39, 310 

 Pedesis or Brownian movement, 118 



overcoming, 118 



with polariscope, 119 

 Penetration of objectives, 302-304 

 Percentage of liquids and solutions, 346 

 Permanent mounting, 322-332 

 Permanganate of potash, spectrum, 252, 



259 

 Photo-engraving, drawing and lettering 



for, 187-193 

 Photographic camera, 206, 210 



enlargements, 233 



magnification rod for, 208-210 



negatives, 177 



objectives, 178-180 



prints, 178, 181, 232, 234 

 Photography, 206-245 



avoidance of distortion in, 207-208 



avoidance of vibration, 219 



bacterial cultures, 213 



color correct, 234-240 



embryos, 209-212 



focusing, 210-21 1, 224 



for making figures, 176-182 



indebtedness to photo-microgra- 

 phy, 216 



lighting for, 209 



living objects, 207 



objects in liquids, 207 



plates, panchromatic and spec- 

 trum, 235, 236-237 



scale of magnification or reduc- 

 tion of photographs, 208 



vertical for (fig.), 207, 210, 218 



scale of magnification or reduc- 

 tion of photographs, 208 



vertical for (fig.), 207, 210, 218 

 Photo-micrograph, 214-215 



color screen with, 244 



determination of magnification in, 

 208, 228 



experiments at 20, 



to 2000 diameters, 225-228 



