Gravitation as explained at the 



present time ... 175 



Grass, why green ... 81 



" why clew deposits on ... 121 



Qrindon, Leo. H. on life ... 22 



Grove, Prof., on matter ... 1 



" confesses ignorance of the 



source" of heat ... 61 



Prof., on electricity ,.. 86 



" on magnetism ... 96 



Gulf Stream, no longer a mystery 167 



Dr. Carpenter on... 167 



H. 



Halley's Comet 174, 175 



Hens, how they transmit their 



mind to their chickens ... 35 

 Heat, natural ... 53 



by combustion ... 53 



by friction ... 54 



Dynamical theory of ... 52 

 Tyndall on 52, 60, 61 



Mayer on ... 53 



as a mode of motion ... 58 

 Grove, Lswdner and" Bi'ew- 



er on ... 61 



independent of matter ... 61 

 Tyndall on sound genera- 

 ting ... 102 

 Hegel on mind ... 37 

 Helmholtz on colour ... 80 

 Herschell, Sir J. F. "W., on the 



waste heat of the sun ... 7l 



Herschell, Sir J. F. W., on the 



temperature of space ... 71 



Herschell, Sir J. F. W., on 



colour ... 80 



Herschell, Sir J. F. "W. , on com- 

 mon sense ... 109 

 Herschell, Sir J. F. "W., on the 



formation of rain ... 109 



Herschell, Sir J. F. "W. , opposed 



to Kamtz's theory of rain . . . 113 

 Herschell, Sir J. F. "VY., on al- 

 tering the weather ... 113 

 Herschell, Sir J. F. W., on the 



reason why trees attract rain.. 114 

 Herschell, Sir J. F. "W., on 



drainage being bad ... 114 



Herschell, Sir J. F. W., on 



weather and weather prophets 128 

 Herschell, Sir J. F. W., on the 



cause of wind ... 128 



Herschell, Sir J. F. TV., on coral 



insects ... 150 



Herschell, Sir J. F. W., on vol- 

 canoes .. 1-55 



Herschell, Sir J. F. W., 6n 



earthquakes ... 150 



Herschell, Sir J. F. "W"., knew 

 of chemical action in the in- 

 terior of the earth . . . 159 

 Herschell, Sir J. F. W., his fail- 

 ure ... 160 

 Herschell, Sir J. F. "W. , on com- 

 et of 1630 ... 174 

 Hercules, collision with ... 46 

 Hills, why purple ... 83 

 Horse latitudes, calms of the ... 129 

 Holland, criminals fed on food 



free from salt in ... 137 



Hound, scent of a ... 34 



Hope, on Origin and Prospects 



of maii ... 37 



" on mind ... 37 



Hot Springs and Geysers, cause 



of ... 50 



Huxley, Prof., on matter and 



motion ... 6 

 " on origin of life 28 

 Hydrogen, in coal ... 141 



" how introduced into 



coal ... 142 



All mineral matter is 2 

 " in the Leonarto met- 

 eorite ... 180 



I. 



Icarus, fate of ... 28 



Ice, action of magnetism in shell 93 

 " hoar frost, spears of ... 123 



" composition of ... 172 



Icebergs, why granulated ... 172 

 Inertia, action of, on the tides... 165 

 Indigestion, The Scotch compar- 

 atively free from ... 138 

 Indigestion, cause of ... 192 

 " not so common in 

 England as in 

 America ... 192 

 Indian, animal mind of an ... 39 

 Instinct, a higher phase of mind 



than appetite ... 33 



Intellectual Observer on rain ... 112 

 Iron, why rust reddens ... 84 



" cross trees, dangerous na- 

 ture of ... 101 

 Iron ships, great mortality in... 99 

 great care should be 



taken in fitting up ... 99 

 the steering appara- 

 tus in, dangerous ... 101 

 the iron stanchions 

 and davits of, are 

 magnetic poles . . . 100 



