INDE X. 



47 



Objects, monnting of opaqne. i, 233 



viii, 73, 92. xi, 248. xiii, 



41 

 raonntiug trausparent. xi, 250 

 natural history, xiv, 350 

 new. ii, 57 

 opaqne under high powers, i, 



205 

 orienting small, xv, 129 

 philosophy of mouutiug. x, G1 

 preparing, xv, 177 

 preparation and luonnting of 



i. 64, 95, 149. ii, 9, 28 

 preservation of natural. xii, 



141 

 preserving, xiv, 350 

 rubber cells for opaque. i, 202 

 shading, xiii, 86 

 some that are mistaken for 



trichiuaj. ii, 47 

 Spencer's, i, 180 

 test, ii, 59 



wax models of. xv, 62 

 White's. X, 110, 164. xiii, 47, 



103. xiv, 288, 304 

 Objectives. 1, 199, 238. ii, 36, 58, 



172. v, 200 

 about, i, 217 

 American, x, 236 

 angles of. ii, 37, 57, 78 

 angle of aperture of immersion. 



iii, 176 

 an ideal series of. ii, 50 

 aperture of. iii, 107 

 a powerful, xi, 141 

 appochromatic. vii, 214, 231 

 B & L's 1-2 inch, ii, 116 

 B & L's 1-6 and 1-8. iii, 137 

 Beck's in photography, iv, 197 

 choosing, v, 214 

 cleaning, xiii, 40, 86, 99 

 condenser, homogeneous. xv, 



59 

 correction, adjustment for. iv, 



28 

 dry. xiv, 19, 20, 109 

 duplex, i, 39 

 focal length of. vi, 141 

 for special use. vi, 95 

 good, iv, 198 

 Grunow's. iii, 199 

 Grnnow's listof. vii, 137 

 Gundlach's half inch, i, 180. 



iii, 19 

 Gundlach's 1-10 inch, iii, 158 

 handling, xiii, 287 

 higb power, i, 58 

 high powers in photo-microgra- 

 phy, vi, 193 

 how to measure, ii, 191 



Objectives, homogeneous immersion. 



iii, 19, 109. iv, 139. v. 



79. vi, 218 

 improved. v, 168. vi, 130. 



vii, 172 

 magnifying power of. v, 205, 



vi, 203. vii, 58. viii, 9, 



xiii, 93 

 maker's name on. x, 278 

 method of finding optical cen- 

 tre, vi, 141 

 new method of attaching, iii, 



237 

 new 1-6 inch, iv, 2 

 new, Powell & Leland. ii, 13 

 one-fifth. XV, 156 

 oue-seventy-fifth inch. xiv, 



299, 320 

 of 20° aperture, vii, 99 

 penetration in. i, 170 

 penetrating power of. iii, 110 

 Powell & Leland 's 1-8 inch, ii, 



240 

 price of Zeiss', xv, 88 

 protecting from dust, v, 200 

 recent improvements in. vii, 



190 

 relative value of, with large and 



small apertures, iii, 129 

 screw micrometer. iv, 139 

 significant angle of. iii, 154 

 Spencer's, vi, 99. vii, 138 

 Spencer and Smith's 1-5 and 1-8 



inch, xiii, 98 

 Spencer's 1-15 inch, iii, 238 

 Spencer's 1-16 inch immersion. 



vii, 57 

 Spencer's 1-10 inch, vi, 59 

 Spencer's 1-10 inch immersion, 



vi, 38 

 Spencer's 1-25 inch, vii, 178 

 strongest, ii, 199 

 testing, iv, 52, 194. vi, 176 

 testing. Abbe's method, iv, 181 

 tests of. iv, 78 

 Tolles. i, 16. iii, 78 

 using oil immersion, xiii, 146, 



288 

 Wales's high power, v, 139 

 which afford the most accurate 



knowledge of histology, i, 



89 

 wide angled, vi, 38 

 wiping. xii, 128 

 working distance of. ii, 32 

 Zeiss'. ' vii, 76, 88 

 Zeiss' 1-8 inch, vii, 118 

 Ocean food-supply, xiv, 211 

 O'Connor, J. T., refractometer. xiii, 



181 



