INDEX OF VOLUMES I TO XX. 89 



VOL. PAGE 



Observatory, Magnetic, at Madison, Wisconsin. E. W. Davis xii 455 



United States Naval. Emma M. Converse iv 704 



Obstructive, The Practical Man as an. F. J. Brain well ii 37 



Ocean-Bed, Inequality of the (Misc.) x 250 



-Currents, Causes of (Misc.) xiv 686 



-Currents of Greenland and Iceland (Misc.) xviii 710 



Ocean, Temperature of the (Misc.) v 507 



Variability of the Level of the (Misc.) xviii 718 



Oceanic Circulation, Wyville Thomson on (Misc.) ix 506 



Oceanica, Black Races of. R. Verneau xviii 744 



O'Connor, W. D. Life-Saving Service, United States xv 182 



Octopus and its Prey (Misc.) iv 254 



Odling, William. Discovery of the Elements i 474 



Phlogiston, Revived Theory of ix 560 



Odors and Life. F. Papillon vi 142 



Offense and Defense, Animal Powers of ix 355 



Oil on Rough Water (Misc.) xv 143, xvi 136 



-Plants of French Guiana. J. Harmond xviii 384 



-Regions, Pennsylvania (Misc.) xiii 252 



Oils, Origin of Mineral (Misc.) xii 124 



Old Age, Necessity of Carefulness in (Misc.) ii 511 



Oleomargarine (Misc.) xiv 249 



Olfactory Nerves. A. L. Child (Cor.) xvii 692 



Onimus, M. Nervous Control of Animal Movements i 344 



Ophthalmia, Contagious (Misc.) vi 377 



Opium and its Antidote. C. Richet xii 555 



-Eating and Intemperance (Misc.) xv 858 



-Habit, The (Misc.) viii 767 



-Habit, Treatment of the (Misc.) xi 763 



Persian (Misc.) xix 716 



-Poppy in France (Misc.) ii 384 



-Smoking, Experiments in (Misc.) xv 429 



Opossum, Habits of the (Misc.) ii 124 



Opossums and their Young. W. S. Barnard viii 149 



Optical Illusion, An (Misc.) viii 254 



Optics, Modern, and Painting. O. N. Rood iv 415, 572 



Some Simple Experiments in. E. A. Youmans xi 658 



Orang-Outang at Home (Misc.) xv 854 



The, and Man (Misc.) vii 758 



Orange, The Osage (Misc.) ii 383 



Ordeals and Oaths. E. B. Tylor ix 307 



Organic Bodies, Artificial Preparation of. I. Remsen vii 726 



Organisms and their Media. H. C. Bastian ix 215 



Organ-Piano, The (Misc.) xiii 378 



Originality, Rights of. Spencer's Priority. (Ed. Tab.) vi 114 



Orion, Telescopic Research on the Nebula of. E. S. Holden v 257 



Ormsby, R. M. K. Carlyle and the Darwins (Cor.) x 363 



Ornament, Evolution in. C. F. Hartt vi 266 



Ornamentation of Copper and Bronze (Misc.) vii 381 



Ornithorhynchus, The Australian xvii 769 



Osteophone, The (Misc.) xvii 142 



