De Lastic, Vicomte, carvings from caves in collection of, 79 Dewar, Sir James, experiments of, 183 Divers, Mediterranean, suggested inhalation of pure oxygen gas by, 261 Diving, Fleuss apparatus, diluted oxygen supply to, 263-265 Donati’s comet, 227 Dragon, heraldic, description of, 114, 115 Dragons, classification of, by heralds, 120 conventional, probable sources of, 126 probable origin, 121-123 snakes and, connection between, 120-123 tradition of, reasons for discrediting suggested, 118-120 Drugs, individual variability (idiosyncrasy) with regard to, 102 Eau-de-Cologne, volatile oils from aromatic plants of Riviera used in manufacturing, 47 “Eel-fare,” term for annual “running up” of young eels, 67, 70, 73, 75 Eel-fisheries, regulation and encouragement by Danish Government of inland, 65 German Government of inland, 65, 66 Eels, age of, knowledge resulting from power of telling, 69 shown by scales, 69 common, period when change from “yellow” to “silver” takes place in, 67, 69, 70 reproduction, migrations and habits of, 66-67, 69-76 “leptocephalus-young-phase” or tadpole of, 71-73, 75 migrations of, geological changes as affecting, 74 Petersen’s researches with regard to “silver,” 68, 69 popularity of, abroad, 65, 66 rare occurrence of, in river Danube, 74, 75 “Elvers,” term for young eels, 66, 67, 70, 71, 73, 75, 76 Europe, iron, stone, and bronze ages of, 375-377 Evelyn, diary of, 229 (quotations) Feeble-minded, distinctions between lunatics and, 274-276 laws relating to lunatics and, need for improvement in, 275 necessity for state guardianship of, 276-278 Feeble-minded children, 278 Feeble-mindedness, atavism suggested cause of, 274 hereditary transmission of, 277 occurrence of cases in all classes of community, 276 views of Government Commission on origin of, 281 Festivals, Christmas, origin of children’s customs associated with, 361-362 English Christmas, introduction of turkey in connection with, 358 origin of heavy feeding at, 357 prehistoric and barbaric customs in connection with, 356-357 Fever, yellow, comparative death-rate from, in Panama Canal zone, 2-4 measures adopted in Cuba and Panama for prevention of, 2, 3 Fish, shell-fish and, individual susceptibility to poison from, 102, 103 Fishes, age of, method of telling, 69 poisonous, 103 poison-spines of, 107, 111 Fixed stars, 221 Flack, Mr. Martin, experiments of, with regard to oxygen gas, 260 Fleuss apparatus, 263-265 Flowers, perfumes discharged into the air by, various effects of, 105, 106 France, cultivation of purple variety of poppy in, 364 French archæologists, leading discoveries with regard to prehistoric man made by, 371, 372