Lightning-bugs, 47. Southey, the poet, on, 49. of West India Islands, 50. Gosse on, 51. common, of Eastern United States, 52. common, of Europe, 56. Luminosity in man, instances of, 116. of plants, 129 _et seq._ Luminous organs of lightning-bugs, 55. ---- fishes, 94. ---- fogs, 146. ---- “ink,” 156. ---- marbles, 155. ---- organs of fishes, 98. ---- paint, 157. ---- showers, 144. Lyell, Sir Charles, on cosmic dust, 152. Mackerel, luminosity of, 104. Marigold, luminosity of, 121. Martyr, Peter, on luminous insects, 62. Meat, phosphorescent, 141. _Medusæ_, or jelly-fish, 10–18. numbers, 11. light-givers, 11. Professor A. Agassiz on, 12. brilliance, 14. Darwin on, 17. Spallanzani on their phosphorescence, 17. Humboldt on, 18. Menhaden, luminosity of, 103. Merian, Madame, on the luminosity of _Fulgora lanternaria_, 66. Meteors of the sea, 10. Monkey, luminosity of eyes of, 114. Moonfish, 105. Mount Blanc, luminous cap of, 146. Mushrooms, edible, 138. Mussel Bay, luminous snow, 74. Nasturtium, luminosity of, 121. _Noctiluca_, 4–9. Nordenskjöld discovers cosmic dust, 148. Oban, sea-pens at, 26. Ogunquit, Me., sunfish at, 104. Ooze, 3. Ovideo on luminous insects, 62. Phantoms, 140. Pholas, 40. Phosphorescence of the sea, 6–9. ---- the secret of, 41. ---- of _Pyrosoma_, 81. Phosphorescence, its uses, 160. Pliny, on the luminosity of Pholas, 41. Polyps, their phosphorescence, 24. Poppy, luminosity of, 121, 123. Pteropods, 42. _Pyrosoma_, 81 _et seq._ Rotifers, 36. San Gabriel Valley, beetles in, 48. Sea-anemones, 20. Sea fans and plumes, 24. Sea-opossum, 75. Sea-pen, 26–28. Sea-slugs, luminous, 44. Sea-urchins, 29. Seas of flame, 86 _et seq._ Serapis, Temple of, 40. Shark, luminous, 99 _et seq._ Slugs, garden, 45. Spiders of the sea, luminous, 76. Squid, 46. Star-fish, 29–32. Sugar, flashes of light from, 155. Sunfish, 104. Toadstools, luminous, 136. Touchwood, or fox-fire, 131. Trepang, 29. Tulasue, M., on luminous fungus, 134. Venus’s girdle, 15. Verbenas, luminosity of, 122. Water-fleas, 72. Water-spouts, luminous, 127. Whales, supposed phosphorescence of, 106. Worms, marine, 35. phosphorescent, 36–39. Worrall, Mr. Isaac W., on luminosity of crane, 109. Transcriber’s Notes: 1. Obvious printers’, punctuation and spelling errors have been corrected silently. 2. Some hyphenated and non-hyphenated versions of the same words have been retained as in the original. 3. Italics are shown as _xxx_. 4. Bold print is shown as =xxx=.