XXX Lndex 
le Nature, 
October 24, 1912 
Nigeria: the Making of Northern Nigeria, Capt. C. W. J. 
Orr, 35; Useful Plants of Nigeria, J. H. Holland, 68 
Nile, see Ethnology 
Nitrates, Manufacture of, from the Atmosphere, E. Kilburn 
Scott, 490 
Nitrogen, Chemically Active Modification of, produced by 
Electric Discharge, Hon. R. J. Strutt, 415 
North Sea and its Fisheries: Royal Institution Lecture, 
Prof. D’Arcy W. Thompson, C.B., 593 
Nova Geminorum No. 2, Various Observers, 42, 94, 121, 
131, 176, 200, 207, 208, 209, 250, 277, 329, 364, 384, 408; 
Supposed Radium Lines in Spectrum, Dr. H. Giebeler, 
432; R. Furuhjelm, Dr. Ludendorff, 589 
Nutrition: Nutrition of the epiphytic Bromeliaceee, C. 
Picado, 53; Nutrition of Farm Animals: Wisconsin 
Experiment Station Bulletins, 618; Principles involved in 
Animal Feeding, Dr. Crowther, 618 
Oceanography: Handbuch der Ozeanographie, Prof. Dr. 
O. Kriimmel, 133; Drift of Sealed Bottle thrown from 
the S.S. Indraghira, 195 
Oenothera biennis: Parallel Mutations in, R. R. Gates, 659 
Oil: Portland Experiments on Flow of Oil, S. D. Carothers, 
415; Oil-finding : an Introduction to the Geological Study 
of Petroleum, E. H. C. Craig, 580; Coal Oil and Gas of 
the Foxburg Quadrangle, Pennsylvania, E. W. Shaw and 
M. J. Munn, 617; Oil and Gas Fields of the Carnegie 
Quadrangle, Pennsylvania, M. J. Munn, 617 
Opsonic-index Estimations, Improved Method, C. Russ, 76 
Optical Aberration, New Treatment of, Prof. R. A. 
Sampson, 363 
Optical Convention, 309 
Optical Science: Address, Prof. Silvanus P. Thompson, 
F.R.S., 436 
Optical (and General) Scientific Instruments, Exhibition of, 
435 
Optics, see Light 
Optics, Applied, Outlines of, P. G. Nutting, 603 
Orchard: How to Make an Orchard in British Columbia, 
J. T. Bealby, Dr. F. Cavers, 497 
Orchid Gastrodia and Fungus Armillaria, Prof. S. Kusano, 
484 
Ordnance Survey, Geodetic Work in the, 479 
Osmotic and Liquid Membranes, Prof. F. T. Trouton, 
Hees 32 
Osmotic Pressure of Sap of Developing Leaves of Syringa 
vulgaris, Changes in, Prof. H. H. Dixon and W. R. G. 
Atkins, 156 
Ovaries, Transplantation of, in Hens, C. B. Davenport, 67; 
the One-sided Reduction of Ovaries and Oviducts in the 
Amniota and Mammalian Evolution, Dr. Hans Gadow, 
416 
Owl, Little) Mr. Meade-Waldo, 510 
Ox and its Kindred, the, R. Lydekker, 523 
Oxford : Oxford Memories, John Viriamu Jones and other, 
Prof. E. B. Poulton, F.R.S., 419; Oxford Gardens, R. T. 
Giinther, Dr. F. Cavers, 497 
Oxydases of Cytisus Adami, Prof. F. Keeble and Dr. E. F. 
Armstrong, 442 
Oysters: Bacteriological Purification in Filtered Water, 
M. Fabre-Domergue, 314; the Slipper Limpet, J. H. 
Orton, 641 
Ozone : Ozone and Ventilation, Leonard Hill and M. Flack, 
72; Ozone Production Plant on Central London Railway, 
304; Ozonair Portable Generators, 486 
Palwobotany : Oak-tree found in excavating near Charing 
Cross, 39; Heterangium hibernicum, sp. nov., Prof. T. 
Johnson, 156; Botrychioxylon paradoxum, a Palzeozoic 
Fern with Secondary Wood, Dr. D. H. Scott, 234; 
Psygmophyllum majus, sp. nova, from Newfoundland, 
Dr. E. A. Newell Arber, 235; Petrifactions of the earliest 
European Angiosperms, Dr. Marie C. Stopes, 258, 641; 
Early Cretaceous Flora of Maryland, E. W. Berry, Prof. 
A. C. Seward, F.R.S., 330; Palzobotany and Botany, 
Prof. J. M. Coulter, 510 : 
Palzontological Society, New, in Germany, 509, 613 
Paleontology: Large Mouse from Cave in Crete, Miss 
D. M. A. Bate, 14; Primitive Animals, Geoffrey Smith, 
31; Skull of Ancient Type of Horse found in a Bristol 
Excavation, Prof. J. Cossar Ewart, 67; New Lower 
Carboniferous Gasteropoda, Jane Longstaff, 104; Fresh- 
water Tortoise from Lower Eocene in Congo, Prof. L. 
Dollo, 119; Power of Flight of Giant Pterodactyles of the 
Cretaceous due to Augmentation of Atmospheric Pressure, 
E. and A. Harlé, 119; Osteology of Pteranodon, Dr. 
G. F. Eaton, 123; Permian Vertebrate Fauna of North 
America, Prof. E. C. Case, 173; Remains of Prehistoric 
Horse in the Stort Basin, Rev. Dr. A. Irving, 218; 
Mammalian Remains at the Base of the Chalky Boulder 
Clay Formation in Suffolk, J. Reid Moir, 269; Recent 
Discoveries of Dinosauria in German East Africa, Dr. 
A. S. Woodward, 273; Insect Remains from the 
Midland and S.E. Coalfields, H. Bolton, 286; Recent 
Work, Various, 408; Skull of Triceratops for British 
Museum, 509; Crocodilian Remains from Upper Ter- 
tiaries of Parana, C. Rovereto, 539; South African Fossil 
Reptiles, Dr. R. Brom, 587; see also Fossils 
Pallidium, Sorption of Hydrogen by, Dr. A. Holt, Dr. 
Edgar and Mr. Firth, 79 
Palms: Annals of the Royal Botanic Gardens, Calcutta : 
Asiatic Palms—Lepidocaryee: the Species of Daemono- 
rops, Dr. Odoardo Beccari, 167 
Panama-Californian Exhibition, 563 
Parasites: Blood Parasites found in the Zoological 
Gardens, H. G. Plimmer, 77; Remarkable Effort of a 
Polyzoan to free itself from a Parasite, O. Schréder, 91; 
Two New Trematode Parasites from the Indian Cobra, 
Dr. W. Nicoll, 416; Blood Parasites of Animals in the 
Zoological Gardens, H. G. Plimmer, F.R.S., 429; 
Trematodes from Australian Frogs, Dr. S. J. Johnston, 
626 
Pathology: Epithelioma of the Embryonic Ectoderm, M. 
Letulle and L. Nattan-Larrier, 209; Achondroplasia, Dr. 
Mark Jansen, 275; International Congress of Compara- 
tive Pathology, 509; Hamarthrosis of the Knee, P. 
Delbet and P. Cartier, 574 
Pearls: the Ceylon Pearl Oyster and the Cestode Theory 
of Pearl Production, Dr. H. L. Jameson, 77 ; Clasmatosis 
of the Shell and Pearl, R. Dubois, 79; Ceylon Pearl 
Fishery, 350; Pearl Industry, H. M. Smith, 640 
Peat, J. J. Stevenson, 513 
Pedigrees, Use of : Royal Institution Discourse, W. C. D. 
Whetham, F.R.S., 310 
Pegmatites, Gem-bearing, of Madagascar, A. Lacroix, 677 
Penguin, Adélie, L. Gain, 483 
Perfumes, Natural, H. Gault, 146 
Peripatus from the Abor Hills, S. W. Kemp, 365 
Peru: Yale Expedition, Prof. H. Bingham, 68; Human 
Remains at Cuzco, 584 
Petrography: Recent Work; British Pillow-lavas, H. 
Dewey and J. S. Flett; Rocks rich in Alkalies, R. A. 
Daly; Improved Petrological Microscope, G. W. 
Grabham, 513 
Petroleum, see Oil 
Pharmacy: Podophyllum emodi, Indian Species, Puran 
Singh, 249 
Phenological Observations for 1911: Report, J. E. Clark 
and R. H. Hooker, 208 
Philadelphia: Medal Awards by Franklin Institute, 13; 
Philadelphia Academy of Natural Sciences, Centenary, 143 
Philippines: Report of Bureau of Science, Dr. P. C. Freer, 
40 
Philosoptine Matter and Mind: Address to Royal Scottish 
Geographical Society, Sir George Reid, 251; see also 
Animism 
Photochemistry : Photochemical Action, Profs. Ciamician 
and Silber, 69; Photochemical Kinetics of the Chloro- 
platinic Acids in very Dilute Solutions, M. Boll and 
P. Job, 157; Photochemical Reaction, a Reversible, M. 
Rindl, 608 
Photography: Photographic Lenses: a Simple Treatise, 
Conrad Beck and H. Andrews, 5; Photography of 
Colour by purely Optical Means, J. and E. Rheinberg, 
117; Rheinberg’s Micro-spectra Method of Colour Photo- 
graphy, 307; Society of Colour Photographers’ Exhibi- 
tion, 352; Photographic Copyright, G. E. Brown and 
A. Mackie, 631 
Photolvsis of Sugars Ketonic by Sunlight and by Ultra- 
violet Light, D. Berthelot and H. Gaudechon, 625 
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