INDEX. 



379 



Microscope, Polarising, Norrenberg's, em- 

 ploy ment of, 373- 

 374. 

 Simple, 256-266. 



See" Eye-piece," "Lenses," "Ob- 

 jective." 



Microtomes, 278. 

 Mirror, general conditions and directions, 



269-270. 

 ,, Scemmerring's Single Reflexion, 



used for drawing, 298. 

 ,, Illuminating, used with Polariser, 



310. 



Mohl on the influence of Cover-glasses on 



Objectives of medium power, 67. 



,, his disapproval of movement of 



stage in focusing, 117. 

 ,, his method of testing Chromatic 



Aberration, 159. 



,, on the position of the Nicol prism 



to the source of light, 310-311. 



,, on cylindrical structures, 352 



(note). 



,, screw-micrometer, 291-292. 

 Mceller Test-plates of, 138. 

 Motion, phenomena of, 252-253. 

 Mueller, (Otto), Limit of Discrimination, 



142. 



Multocular Microscopes, 48-50. 

 Muscle, fibres of, example of polarisation, 

 372. 



NACHET'S Erecting Eye-piece, 46. 



,, stereoscopic binocular Micro- 

 scope, 50 ; 224. 



Navicula rhomboides, 137, 138. 

 Needle for preparing specimens, 275. 

 Nicol's prism, 305-315. 

 Nitzschia sigmoidea 137, 138. 

 Nobert's Test-plate, 139-140. 

 Nodal-points, 8*. 



Norrenberg's Polarising Microscope, em- 

 ployment of, 373-374. 



OBERH^IUSER'S camera lucida, for draw- 

 ing, 298. 



,, Cylinder-diaphragms, 120. 



,, Erecting Eye-piece, 45. 



,, Horse-shoe stand and 



Drum stand, 122. 



Object-distance increased by approxima- 

 tion of Refracting surfaces, 33. 

 ,, of objective-system, 34. 

 Object-slide, Bourgogne's, 287. 



,, stage, 117. 

 Objective, the, 27-34. 



,, magnifying power of, not 



constant, 36-37. 



, , of multocular Microscopes, 50. 



,, combination of lenses in, 61. 



Objects, Air-bubbles in water, 191-202. 

 ,, alternate solid and aqueous 



Layers, 221. 

 cylindrical, 349-362. 

 ,, Elevations and Depressions as, 

 opposed to dense and soft layers 

 221-222. 



,, globules of Oil in water, 202-206. 

 ,, Hollow spheres and Hollow cylin- 

 ders, 206-217. 

 ,, Membranes with small depression 



or holes, 217-219. 



,, ,, bounded by one plane 



and one undulating 

 surface, 219-220. 



,, ,, bounded by parallel un- 



dulated surfaces, 220- 

 221. 



,, sections opaque in conseq. of con- 

 taining air, how remedied, 279. 

 ,, spherical and oval, 362-366. 

 ,, ,, with equal dia- 



meters, 363- 



365. 

 ,, ,, ,, with one axis, 



365, 366. 



,, action of anisotropic crystalloid 

 bodies, viewed separately, 319- 

 341. 



,, action of two superposed crystal- 

 loid bodies, whose planes of 

 vibration intersect obliquely, 

 341-349. 

 ,, apparatus for turning the, 315- 



319. 

 ,, delineation of the fine structure 



of, by interference, 226-236. 

 ,, drawing of, 296-303. 

 ,, measurement of, 288-296. 

 , , polarisation phenomena, collection 

 of examples, 368-373. 



