304 



THE USE OF THE MICROSCOPE 



Beck, lens over eyepiece, 81 

 maximum cone, 92 

 reflections in slide, 68 

 resolution with dark field, 203 

 source, diaphragm, 11, 67, 69 



small, 203 

 superposed ground glass, 78 

 tourmalins, 231 

 Berek, colors in dark field, 95, 212 

 Bicentric condenser, 94 

 Binocular, attachment, 47, 52, 143 

 care of, 183 

 converging-tube, with reading 



spectacles, 54 

 correcting glasses for, 24, 25 

 cover-glass correction, 263 

 distance between eye-points, 23 

 fields of, 23 



increasing tube length of, 113 

 magnifiers, 22, 24 

 miniature, 23 

 monobjective, construction, 46 



disadvantages of, 52 



origin of, 202 



practical points, 53 



stereoscopic effect of, 49 



summary, 52 



tube length, 263 

 parallel-tube, with distance spec- 

 tacles, 54 

 parallel tubes, advantages of, 48 

 spectacles for, 24, 25 

 suggested, 23 

 testing, 173 

 twin-objective, adjustment of, 39 



care of, 184 



centering, 42 



cleaning, 42 



construction of, 38 



convergence in, 37 



correcting glasses for, 45 



with distance spectacles, 45 



divided mirror for, 41 



double prism for, 41 



eyepiece distance, 39 



eyepieces for, 40 



faults of, 42 



focusing, 39 



illumination, 40 



Binocular, twin-objective, low-power, 

 23, 37 



objectives for, 40 



objects for, 105 



origin of, 201 



original account of, 43 



practical points, 44 



with reading spectacles, 45 



source of fight for, 41 



summary, 44 



tests of, 43 

 vision, non-stereoscopic, 50 



stereoscopic, 43, 49 

 yellow-green filters for, 75 

 Binoculars, compared, 37 

 Bituknibinocularattachment,52, 106 

 Bitumi binocular attachment, 47 

 Blind spots, 50 

 Blood, preparations of, 239 

 Boegehold, homal, 203 

 Brazilin, in immersion oil, 105 



preparations stained with, 243 

 Brown, simple microscope, 197 

 Brownian movement, with water- 

 immersion objective, 240 

 Bruecke magnifier, 196 

 Bull's eye, disadvantages, 72, 73 

 near source, 71 



C 



Cambium, tissues from, 231 

 Camera, Abbe, adjusting, 264 

 use of, 161 

 photographic, 166 

 Canada balsam, as mounting 

 medium, 103 

 disadvantages of, 103 

 objects in, 99 

 Carina flaccida, chromosomes, 226 

 Cardioid condenser, 94 

 Carpenter, book on the microscope, 

 198 

 stereoscopic vision, 52 

 Carpenter-Dallinger, aperture of 



uncorrected condenser, S3 

 Cassegrain condenser, 95 

 Cedar oil, as clearer, 242 

 as mounting medium, 103 



