KNOWLEDGE. 



Oilfield of Bradford, Derricks in the 



Oil Refinery at Philadelphia 



Oil Well after being Torpedoed 



Orbits of Mars, DQ, and the Earth, 

 Relative Disposition of the 



Papuan Girl, Head of 



Peas grown in Experiments on the 

 Fixation of Free Nitrogen 



Plants, Self-irrigation in- 

 Centrifugal and Centrij)i-t!il Irri- 

 gation 

 Nodding and Aiirieulate Lpares 

 Rain-conducting Channels 

 Leaf -cups of Teasel 

 Irrigation of the Chick-weed; 

 transverse section of Chickweed 

 stem ; vertical section of Chick- 

 ^^'eed stem 

 Rotifer inhabiting the hood of a 



Scale-Moss 

 Animals inliabiting the axils of 

 leaves 



Quarry at Whitehead, Belfast Lough 



Rainfall. Curves of 



Raspberry Shoot affected with " the 

 maggot " of Lampronia rvbirlla ... 



125 

 152 

 126 



161 

 161 

 162 

 173 



174 

 246 



246 

 207 

 130 



Raspberry Shoot, showing Larva of 



Lampro.nn ivh/flla . ... 211 



" Reversing Layer." Photograph 

 of the I'l 



Roberts, Dr. Isaac, Full page photo 

 graphic Plates by- 

 Spiral Nebula Messier 35 Trianguli 39 

 NebidiT- near 7 Cassiopeiie ... 106 



Nebula iji V .■H7 Cygni 253 



Rocks, Ridge of Ancient, seen from 

 Church Stretton, Shropshire ... -7 



Sea Otter, Upper and Lower Teeth 



of the ... . ~'.< 



Solar Corona, The, 1898, January 22 1.">C. 



Spectra, Comparative 

 Reduction of 



Scale for 



100 



Spectra of Ceti (1897, December), 

 and a Herculis (1898. February), 

 Photographed at Stonyhurst Col- 

 lege Observatory ... 113 



Spectrum of an Eclipse, The ... 185 



Spectrum of Ceti 61 



Sun's Corona. The Total Eclipse of, 

 January 22, 1898 ... 50, 108, 109 



Sunspot, Ideal Vertical Section of a 113 



PAGE 



Sunspots, A Group of 181, 182 



Sunspots and Life (Diagram of 



Curves) ... 23.". 



Sunspots, The Great Group of (Sep- 

 tember 3-15, 1898i 228 



Sunspots, The Level of— 



Symmetrical Spot, Elevated Pen- 

 umbra ... ... ... ... 89 



Symmetrical Spot, Penumbra with 



'Dark Margin 89 



I'nsymraetrical Spot, Penumbra 

 wanting on one side ... ... 90 



Spot without Penumbra ... ... 90 



Sunspots 90 



Empty Vessel, with black bottom 

 just in view ; the same filled with 

 water: the same viewed verv 

 obliquely '90.91 



Tasmanian Woman 22.5 



Temperature. Curve of Annual ... 129 



Temperature, Curve of Daily ... 129 

 Venom Fang, Evolution of the 92, 93 



Vinegar Mite, The 140 



Whale Gallery at the Natural His- 

 tory Museum, View in the ... 195 



Wigcon's Nest and Eggs ... 36 



