WILLIAMS, F. X.: 1916, Photogenic Organs and Embryology of Lampyrids. _Journ. Morph._, vol. xxviii, pp. 145-186. YATSU, N.: 1917, Note on the Structure of the Maxillary Gland of Cypridina hilgendorfii. _Journ. Morph._, vol. xxix, pp. 435-440. YOUNG, C. A.: 1870, The Spectrum of the Firefly. _Amer. Nat._, vol. iii, p. 615. ZACHARIAS, O.: 1905, Beobachtungen ueber das Leuchtvermögen von Ceratium tripos. _Biol. Ctbl._, Bd. xxv, pp. 20-30. INDEX Abegg, R., 147 _Acanthephyra_, 78 _Agaricus_, 99 Agassiz, A., 11 Alkaptonuria, 17 Allman, G. I., 11, 71 Ammonia, 12 Anodoluminescence, 26, 29 _Anornalops_, 69 Aristeus, 72 Aristotle, 1 Bach, A., 137 Bacteria, luminous, 2, 10, 13, 14, 16, 18, 28, 45, 53, 61, 65, 69, 72, 74, 81, 82, 89, 99, 101, 103 Bacterial lamps, 18 Baker, J., 2 Bancroft, W. D., 36 Bancroft and Weiser, 24 Bandrowski, E., 33 Barcroft and Hill, 98 _Barnea_, 116 Batelli and Stern, 115 Becquerel, E., 26 Beijerinck, M. W., 18, 89, 99, 100, 102 Bigelow, S. L., 34 Black, 91 _Bolitophila_, 77 Boyle, R., 1, 16, 85 ff Brandt, 36 Brittle stars or ophiuroids, 10, 11, 72 Canton's phosphorus, 27 Carbon dioxide and luminescence, 91 ff _Cardium_, 116 Cascariolo, V., 27 Cathodoluminescence, 26, 29 _Cavernularia_, 74, 103 Centnerzwer, M., 147 Cephalopods or Squid, 10, 11, 13, 68, 72, 84, 104 _Ceratium_, 71 _Chætopterus_, 10, 17, 42, 71, 73, 74, 83, 103 Chemiluminescence, 36 ff, 45 ff Chlorophyll formation by animal light, 66 _Chromophyton_, 15 Chun, C., 79 Coblentz, W. W., 30, 31, 44, 51, 52, 59, 60, 62, 64, 93, 160. Co-enzyme, 104, 130 Co-luciferase, 107 ff Color of animal light, 41 ff, 157 ff Concentration and luminiscence, 145 ff Conroy, J., 43 Crozier, W. J., 71, 103 _Crustacea_, 10, 14, 68, 70, 72, 89, 101 ff Crysalloluminescence, 33 ff, 74 _Ctenophores_, 2, 10, 11, 71, 72, 82 Cyanides and luminescence, 126 _Cypridina_, 14, 30, 45, 48, 63, 71, 73, 75 ff, 90, 92, 98, 103, 105 ff, 155 ff Dahlgren, U., 72, 73, 75 "Death Glow," 69 Dinoflagellates, 2, 10, 32, 82 Dubois, R., 31, 35, 37, 43, 45, 49, 61, 64, 73, 103 ff, 111, 114 ff, 131, 155 Earthworms, 10 Efficiency of animal light, 48 ff Eggs, luminous, 11 Electroluminescence, 24, 29 Embryos, luminous, 11 Euphasia, 72 Ewan, T., 147 Exner, S., 30 Extracellular luminescence, 68, 71 Eyes, luminous, 15 ff Fabre J. H., 99 Fahrig, E., 37 Fireflies, 10, 31, 34, 43, 69, 71, 77 ff, 89, 93, 101, 103, 135, 160 Fishes, 1, 3, 10, 18, 64, 69, 72, 84, 85 Flowers, flashing of, 16 Fluorescence, 25 ff, 62 Fluorescent screens, 29 Forsyth, R. W., 53 Frankland, P., 62 Friedberger & Doepner, 65 Frogs, luminous, 13 Fungi or Basidiomycetes, 10, 69, 72, 81, 89, 99, 101 Galloway and Welch, 84 Gernez, D., 32 Giard and Billet, 13 Giesbrecht, W., 11, 70