INDEX 



291 



Continuous, current arc lamp, 249 ; spec- 

 trum, 137. 



Contoured, doubly, 97. 



Converging lens, 3-5 ; lens system, 9. 



Convex lenses, 3-5. 



Cooler, specimen, 257. 



Correction, chromatic, or color, 5, 12, 268- 

 270 ; cover-glass, 55-56 ; cover, tube- 

 length for, 56-57 ; over and under, 12. 



Cotton, collodion, gun, or soluble, 200. 



Counterstaining, 189-190. 



Cover-glass, or covering glass, 162-163 ; 

 aberration by, 54 ; adjustment, spe- 

 cific directions, 55 ; adjustment for, 

 in photo-micrography, 234; adjust- 

 ment and tube-length, 12, 13, 55 ; 

 anchoring, 170 ; cleaning, 162-163 ; 

 correction, 55, 56 ; effect on rays from 

 object, 17, 55 ; gauges, 164-165 ; meas- 

 urer, 164-165; measuring thickness of, 

 163 ; non-adjustable objectives, table 

 of thickness, 14; No. 1, variation of 

 thickness, 164; putting on, 94, 167; 

 sealing, 169, 170; size of, 164, 162; 

 thickness of, 13, 14, 163-165, 193 ; 

 tube-length with, 13, 56, 57 ; wiping, 

 163 ; with, serial sections, 193. 



Crater of carbons, 252. 



Critical angle, 54. 



Crystals, biaxial, depolarizing, 154 ; from 

 frog for pedesis, 100. 



Crystallization under microscope, 50, 157. 



Crystallography, 155 ; list of substances 

 for, 156-157. 



Currents, diffusion, avoidance of, 180 ; 

 in liquids, 98. 



Cutting sections, 178, 186, 191-192. 



D 



Dark-ground illumination, 37, 49-50 ; 

 with Abbe illuminator, 50 ; with 

 mirror, 50. 



Daylight, lighting with, 35. 



Deck-plugs for collodion blocks, 178. 



Dehydration, 177, 190. 



Demonstration, microscope, 243-245; 

 with micro-projection apparatus, 265. 



Depolarizing crystals, 154. 



Designation, of oculars, 25 ; of wave 

 length; 143. 



Determination, of, field of microscope, 

 28 ; equivalent focus, 272-273 ; mag- 

 nification, 103-109, 273 ; of working 

 distance, 39. 



Diamond, writing, 196. 



Diaphragms and their employment, 36-50. 



Diffraction, grating, 137 ; illusory ap- 

 pearances due to, 101. 



Diffusion currents, avoidance of, 180. 



Direct, light, 35 ; vision spectroscope, 

 134- 



Dispersing prism, 137. 



Dissecting microscope, 8, 33, 175, 228. 



Dissociator, formaldehyde, 201 ; nitric 

 acid, 203. 



Distance, principal focal, 3. 30 ; standard 

 at which the virtual image is meas- 

 ured, 109 ; working d. of simple mi- 

 croscope or objective, 39 ; working 

 d. of compound microscope, 11, 34, 

 39-4o. 



Distinctness of outline, 96. 



Distortion in drawing, avoidance of, 124. 



Diverging lens, 3. 



Double spectrum, 142 ; vision, 103, 105. 



Doubly contoured, 97 ; refracting, 152. 



Draw-tube, Frontispiece ; pushing in, 38. 



Drawing, with Abbe camera lucida, 129- 

 131 ; board for Abbe camera lucida, 

 129, 130 ; distortion, avoidance of, 

 124 ; embryograph for, 132 ; with 

 microscope, 122 ; photographic cam- 

 era for, 132 ; for photo-engraving, 

 273 ; scale and enlargement of, 131 ; 

 with simple microscope, 132. 



Dry objectives, 10, 16-18 ; light utilized, 

 17 ; dry mounting, 167 ; numerical 

 aperture, 16 ; dry plates, discovery by 

 Maddox, 221. 



Dust, of living rooms, examination of, 

 101 ; on objectives and oculars, how 

 to determine, 92 ; removal, 60. 



Dye, general, staining with, 189 ; aque- 

 ous, 180, 189 ; alcoholic, 180, 189. 



E 



Eccentric diaphragm, 44, 49-50. 



Egg pippett, 280. 



Electric light, 37, 229, 235, 250. 



Embryograph, 132 



Embryos, camera for, 211 photograph- 

 ing, 211-214; records of, 213. 



Engraving glass for bull's-eye condenser, 

 228 



Enlargements, 241. 



Eosin, 2or. 



Epidiascope, 266-267. 



Episcope, 267. 



Equivalent focal length or focus of objec- 

 tives and oculars, 10, 25, 272. 



Erect image 1. 



Ether, alcohol, 201 ; sulphuric, 201. 



Ethylic alcohol, 19S. 



Examination of dust of the living rooms, 

 bread crumbs, corn starch, fibres of 

 cotton, linen, silk, human and ani- 

 mal hairs, potatoes, rice, scales of 

 butterflies and moths, wheat, 101. 



