420 SCIENCE FROM AN EASY CHAIR 



Moustierian period continued 



skulls and skeletons found in 



cave - deposits allotted to, 



37i 385, 393-395. 406, 



408 

 Mussels, pond and river, propagation 



of, 144, 145 



protection of young, 144 

 Mycenae, discovery of, by Schlie- 



mann, 16 



Neander men, comparison between 

 skulls of Australian abori- 

 gines and, 396, 397 



inferiority of, as compared with 

 Cromagnards, 390 



reasons for recognition of, as 

 distinct and primitive 

 species, 371, 385, 390, 402- 



403, 407 



Neolithic Period, civilisation com- 

 prised in, 377-378, 380 

 definition of, 377 

 Nettles, poisonous stinging hairs of, 



103, 104 

 Newton, Sir Isaac, discovery of law 



of gravitation, 230 

 Halley and, friendship of, 230 



Opium, derivation of word, 364 

 eating, practice in India of, 366 

 medicinal value of, 368 

 poppy used for manufacture of, 363, 



364 

 smoking, introduction by Chinese 



of, 366-367 

 Osborne, Professor, United States 



representative at Darwin 



Centenary Celebration, 33 

 Oxygen gas, 259 

 Oysters, care of breeding, methods 



adopted for, 141 

 classification of, 129 

 common, protection of young, 134, 



144 

 destruction of typhoid germs in, 



128, 129 



French "green," 141, 142 

 gill-plates or "beard," 131 

 growth and maturity of, 134, 136 

 heart and blood-vessels, 132 

 lake, cultivation by ancient 



Romans, 140, 141 

 nervous system, 1 32 



Oysters continued 

 primeval man and, 139 

 propagation of American and 

 Portuguese species, 137, 143, 

 144 



common or North Sea and 

 Channel species, 132-137, 

 143 



structure and nature of, 129-137 

 Ozone gas, 251 



Palaeolithic period, definition of, 377 

 period of chipped flints, primitive 

 arts and surroundings of, 

 378-381 



Panama, measures adopted for pre- 

 vention of yellow fever and 

 malaria in, 2, 3 



Perrier, Edmond, French representa- 

 tive at Darwin Centenary 

 Celebration, 39 



Petersen, researches of, with regard 

 to "silver" eels, 68, 69 



Pettenkofer (Munich), experiment by, 

 in connection with cholera- 

 bacillus, 240 



" Phagocytes," use and importance of, 



39, 179 



Philosophical Transactions, date of 



first published number, 229 

 Philosophical Zoology (Lamarck), 20 

 Phylloxera, 336 



injury and loss caused by, 334, 337 

 introduction into Europe, 337 

 parasitic nature of, 337 

 propagation of, 336, 337 

 Piette, M., carvings from caves in 

 collection of the late, 79, 80 

 Planets, changes on, probable result 



of, 223, 224 

 Plant-lice, 322 



Plants, American, poisonous stinging 

 hairs possessed by certain, 

 104 



association of, with insects, 296 

 jumping bean as exemplifying 

 association of insects and, 

 297, 298-300, 302 

 movements of, definite and varied, 



160, 161 



poisonous, special chemical sub- 

 stances produced from, 100 

 use of, in manufacture of Eau-de- 

 Cologne, 100, 101 



