4 i 6 SCIENCE FROM AN EASY CHAIR 



Death-rate, diminished, reasons ac- 

 countable for, 284, 285 

 health of locality determined by, 



283 



records of, methods of keeping, 

 283, 284 



Death-watch beetle, 351, 352 



De Lastic, Vicomte, carvings from 

 caves in collection of, 79 



Dewar, Sir James, experiments of, 

 183 



Divers, Mediterranean, suggested in- 

 halation of pure oxygen gas 

 by, 261 



Diving, Fleuss apparatus, diluted 

 oxygen supply to, 263-265 



Donati's comet, 227 



Dragon, heraldic, description of, 



"4, "5 



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 (idiosyn- 

 crasy) with regard to, 102 



Eau-de-Cologne, volatile oils from 

 aromatic plants of Riviera 

 used in manufacturing, 47 



"Eel-fare," term for annual "run- 

 ning up" of young eels, 67, 



7, 73, 75 



Eel-fisheries, regulation and en- 

 couragement 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 



Eels continued 



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 "sug- 

 gested 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 chil- 

 dren'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 sus- 

 ceptibility to poison from, 

 102, 103 



Fishes, age of, method of telling, 69 

 poisonous, 103 

 poison-spines of, 107, 1 1 1 

 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 



