INDEX. 



Absorption spectra .... 114 



Acoustic curves 61 



Air thermometer . . . . . 144 



Animalcule cage 33 



Arc light, To project .... 161 



Biaxial crystals 132 



Bubbles 107 



Bubbles, cohesion of . . . . 168 



Calorescence 14i) 



Camphor on water .... 47 



Camera obscura ....... 80 



Candle power 13 



" flame, To project. . C2, 100 



Capillarity 49 



Caustics by reflection ... 92 



" " refraction ... 104 



Chameleon top 143 



Chemical tank 34 



" reactions .... 157 

 Chladni's experiment ... 62 

 Chromatic aberration . . . 104 

 Chromatic aberration, lessen- 

 ing of 169 



Chromatrope . ...... . 142 



Cloud formation 145 



Cohesion 45 



Cohesion figures 47 



College lantern 41 



Colors of thin films .... 107 

 Concave mirror, To project 



with 63, 91 



Convection in water .... 156 



" air 98 



Condenser : its use .... 26 



Convex mirrors 93 



Crova's apparatus 77 



Crystalline substances for po- 

 larized light 133 



Darkened room 5 



Diagrams on mica 129 



l)i:i magnetism 151 



Diffraction 137 



Disks for study of colors . 110, 143 



Dispersion 105 



Distortion 93 



Divisibility of matter .... 44 



Double refraction 126 



Double salts, Prepared . . . 134 



Drummond light 11 



Eidotrope 42 



Electric light 9 



" "To project . 153 



Electric spark, To project 166 



Elements, Spectra of . . 165 



Engravings,. To transfer 32 



Etching upon glass . . 31 



Films, Vibration of . . 169 



Floating magnets ... 167 



Fluorescence 119 



Focal length of lenses ... 21 



Focusing 25 



Fountain, Illuminated ... 96 



Fraunhofer's lines Ill 



Galvanometer 147 



Gases for lime light .... 11 



Ghost . 84 



Glue, Marine 35 



Gramme machine 9 



Gravitation 50 



Heat ........ 144, 155 



Heliostat 1 



Ice flowers 52 



Illumination, Intensity of . 81 



Images formed by lenses . . 100 



Incandescent electric lamp . . 163 



". lamp fil- 

 aments 164 



Incandescent electric lamp, 



Currents for 164 



Interference 71 



" spectra .... 118 



Interlacing lines 70 



Kaleidoscope . 

 Kaleidophone 



159, 



Lamps, Electric arc 



" Incandescent. . . . 163 

 Landscape projection .... 170 



Lanterns 14, 18, 19 



Oxyhvdrogen, 12, 16, 18, 19 



Electi-ic 161 



Lenses ,. . 19 



" Magnifying power . . 33 

 " Mountings for .... 23 



Light 80 



" Intensity of 13 



