INDEX TO THE
PRECEDING PAVER.
N.B.    The figures refer to the articles, the letter* to the uritjintil mt pp. 400—407.
Absorbing and reflecting power, determination of, with respect to invisible rays, 194—196, 201—204, Absorption, on the cause of, 237, 238; connexion of, with internal dispersion, 59, 60, 63, 71, 70, 120, 126, 146, 148.
Air expelled from water, 172.
Appearance of highly sensitive media, 27, 29, 164.
Archil, 65-—71.
Canary glass, 73—77, F.
Chemical applications of internal diH-pcrsion, 67—70, 205—214.
Clearness of sensitive fluids accounted for, 86.
Coloured glasses, fundamental exi>eri-ment with, 7; nature of the blue reflexion in orange glasses, 7^(.); examined for dispersion, 167, KiH.
Colourless glasses, internal diBperwon in, 78; defect of transparency of, 22, 202, 217—219, A.
Colours of natural bodies, 174-......17H.
Concentration and dilution, effect of, 185—188.
Crystals, natural, 165, 166 (see Fluor-spar, Uranium).
Datura stramonium, solution, 43; paper, 95; capsules, 117.
DisperBion, true and false, defined, 25; distinguished, 26, 21); cautions, 100- -173; usual features of true, 44—4(>; on the cause of true, 226—-236; nature of false, 179; instances, 181; applications, 180, 182.
Epipolic dispersion, 1; explanation of, 6.
Esculine, 31, 212.
Explanation of terms, 21—30, 101.
Eye, opacity of the, 220, K.
Fixed lint's of the inviniMo rays, exhibited, 16; deHc;ription of the, 21 23, A, II; effect of viewing through a prism the fixed linen «ho\vn by meana of HOUHitive media, 17, Hi) 93, 1(K).
FlameH, effect of varioUH, 197 —200.
Fluor-Hpar, 32   36.
Groundsel, petain of the purple, 120.
Guaiacum, solution, 37 41; washed paper, i)H; .solution of, mied uk a tent object, 200.
Heat,  effect  of,  on   the  sensibility-   of
ghlKH, d'C., 1HL
Horse-chi.'Htnut, 31, 212.
Illuminating power of the highly refrangible niys, loi, It),"., 11.
Internal diHper.sion, 2.
Lavender rays, !().">, B.
Leuf-Krecn, absorption, 47 -VJ; internal dispersion, .13 111, '.17, IIK, 121.
Litfhtnintf, elTect of, J.
Linear KpKilrum, 107 1011; mudta obtained with u, 113 KM"*, iVt;.
List of highly Hen:<utive :-m balance,;, iiii'.l.
Litmus, 72.
Mercurial!:; perennis, o'2    <» I.
Methods of observation, general, 13, 17, 110, 112.
Mutual action of incident rays, nrp.ativr results with referenet; to the, 21."», 2lit,
23:>, 23<;.
Pennanf.anate of polansa, abi-orjitinn, I). Phosphorescence compared with internal
dispersion, 220    225. Phosphoro^enic rays of an electric . park,
nature of the, 219    221, A. Polarisation,  absence  of,   in   di: prrnrcl
li^lit, 1,   h">;   of  the incident, ray:* a
matter of indifi'ercucr, 20,