IXDEX. 



323 



Mutual reaction of physical agents, 



52, 54, 120 

 Mutual reaction of physical agents, 



misapprehension regarding, 52 

 Mfftilua edtUis at Spitzbergen, 194 



NEBULJE, probable origin of, 

 297 



reason why they 

 occupy so much 

 space, 301 

 why of such various 



shapes, 304 

 why they emit such 



feeble light, 304 

 heat and light can- 

 not result from 

 condensation, 306 

 gaseous, first condi- 

 tion of, 30S 

 irresolvability due 

 to gaseous condi- 

 tion, 30S 

 Prof. Tait's sugges- 

 tion as to nebula, 

 310 

 Newcomb's, Prof., reason for con- 

 sidering his objec- 

 tions, 18 

 ,, objections to my 



terms, 19 

 ,, on aerial currents, 



23, 24 

 ,, on Prevost's theory 



of exchanges, 31 

 Neumayer, Dr., on drift currents. 



Ill 

 Newton's law of radiation, 22 



,, in relation to tempera- 

 ture, 145 

 "Noashina," 181, 193 

 Nordenskjold, Prof., on absence of 

 boulders in Green- 

 land strata, 170 

 ,, on Spitzbergen in- 



terglacialbed,194 

 ,, on interglacial de- 



posits, 194 

 North ward-flowingcurrents, causes 



affecting, 112 

 Northern Siberia, mammoth in. ITS 

 ,, former limit of 



wood in, 1 SO 



North-Western Europe, path of 



ice in, 133 

 Norway, ice-sheet of, 247 



OBJ ECnONS to theory of stellar 

 heat and light considered, 

 310 

 Obliquity of ecliptic, change of, 



4, 115 

 Ocean-currents, influence of, in 



Arctic regions, S 

 Orkney Islands, glaciation of, 169 

 Osborn, Capt., on Arctic trees, 193 



PALAEONTOLOGY in relation 

 to modification of theory, 126 

 Paleochrystic sea, 77 

 Parallax of stars, few known, 314 

 Payer, Commander Julius, on Franz 

 Josef Land. 70 

 ,, on permanent ice at sea 

 level, 76 

 Peach, Mr. B. N., on great fault 

 between Silurian and O.R. sand- 

 stone, 269 

 Penck, Dr. A., on German inter- 

 glacial beds, 133 

 Perihelion summer not hot, 53 

 Permanent ice without perpetual 



snow, 89 

 Physics in relation to Mr. Wal- 

 lace's modification, 100 

 Physical conditions of Antarctic- 

 ice, 202 

 Physical agents in relation to 

 melting of ice, 

 119 

 ,, mutual reaction of, 



52, 119 

 Physical theory, no hypothesis, 16 

 ,, three factors of, 



84 

 ,, modification exa- 



mined, 89 

 general statement 



of, 91 

 does not account 

 for all condi- 

 tions. '.'1 

 ,, a misapprehen- 



sion regarding, 

 92 



