354 INDEX. 



PAGE. 



Nebular Spectroscopy 224 



Nelson, Horatio 129 



Nichols, E. L v, 30 



Publications by 42 



Researches in Physics 338-342 



Nicholson, Norman Clive 107 



Publication by 42 



Nicholson, Seth B 204, 205, 208, 215, 220, 226, 232 



PubHcations by 42 



Norris, E. H 100 



Noyes, Arthur A v, 30 



Chemical Investigations of 294 



Nutrition Laboratory, Publications of 245-248 



Report of Director of 237-248 



Nutrition, Researches in 324-329 



Obreshkove, Vasil 112 



Observing Conditions at Mount Wilson 212 



Ocean, Atmospheric-electric Work 251 



Magnetic Work 249-251 



Work of Department of Terrestrial Magnetism 256-264 



Officers of Institution for 1918 in 



Olcott Meridian Circle 192 



Optical Glass, Manufacture of 135-137 



Shop at Mount Wilson 233 



Surfaces, Sensibility of Foucault Knife-edge Test for 232 



Osborne, Thomas B v, 30 



Publications by 42 



Researches in Nutrition 324 



Osgood, Herbert L v, 30 



Institutional History of American Colonies during French Wars 320 



Paleontology, Researches in 331-333 



Papers from Department of Marine Biology 34 



Parallax and Luminosity, Spectroscopic Determinations of 223 



Parallaxes and Proper Motions, Measurements of 215 



Paris Archives, Calendar of Papers relating to the History of the Mississippi Valley 154 



Guide to Materials for American History in 153 



Parkinson, W. C 252, 253, 266 



ParUament, Proceedings and Debates concerning North America 157 



Parmelee, James in, rv 



Parsons, Wm. Barclay in, iv 



Paton, Stewart in, iv 



Paullin, CD 154, 158 



Pearce, Roy G 240 



Pearson, Karl 128 



Pease, Francis G 204, 205, 214, 219, 224, 232 



PubUcations by 42, 43 



Pennypacker, John Y 112, 127 



Pepper, George W in, iv 



Perez, Luis Marino 155 



Perret, Frank A 134, 135 



Report on Volcano Studies at Naples 137 



Peters, C. H. F 11 



Peters, W. J 253, 269 



Publications by 43, 271 



Pentose Sugars in Plant Metabolism 78 



Peru, Magnetic Observatory Work in 253 



Pfund Arc, Development for Standard Purposes 229 



PhilUps, A. H., Publication by 34 



Phillips, P. Lee 151, 154 



Philology, Researches in 334 



Photometry, Miscellaneous 220 



Photosynthesis, Metabolism, and Growi;h of Plants 73-87 



Physical Laboratory at Mount Wilson 224 



Physics, Investigations concerning 335-342 



Physiology, Investigations concerning 334 



Pigeons, Heredity of Ataxia and Defective Plumage 128 



Sex in 118 



