328 



INDEX. 



PAGE. 



Oxygen Content of Svirface-water of the 



Pacific Ocean 167 



Radial Velocities 208 



Rankin, G. A., Publications by 36 



Publication on the Ternary System .... 132 



Ratnowsky, Simon 130 



Rats of Alcoholic and Non-Alcoholic Par- 

 entage, Studies of 109-114 



Raymond, Harry 179, 180 



Publication by 37 



RajTnond, W. J 236, 258 



Paleontology, Investigations in 310-314 



Parkinson, W. C 237 



Parliament, Proceedings and Debates Re- 

 specting North America 143 



Parmelee, James iii, rv, 3 



Parsons, Wm. Barclay iii, rv, 3, 44 



Paton, Stewart iii, rv, 3, 44 



Paullin, CD 139, 141, 147 



Peabody, Dorothy A 221 



Pease, Francis G 187, 212, 215 



Publication by 36 



Peckham, Leslie E 124 



Pennypacker, John Y 85 



Pepper, George W in, rv 



Period-Luminosity Curve of Cepheid Varia- 

 tion 204 



Peru, Observatory in 237 



Peters, W. J 15, 236, 237 



on Results of Dip-of-horizon Measure- 

 ments on Galilee and Carnegie 264 



Publication by 36 



Pfister, Bertha 125 



Phillips, P. Lee 140 



Phosphorescence, Two Types of 317 



Photographic Magnitudes for Selected Areas 201 



Photographs of Nebulae and Clusters 199 



Photometry of Star Clusters 204 



Photosynthesis and Respiration 60 



Photovisual Magnitudes for Selected Areas . . 203 



Physical Laboratory at Mount Wilson 213 



Physics, Investigations in 314-319 



Phytometer Method in Ecology 288 



Phytosynthetic Eflficiency, Investigations in 289 



Pidgeon, H. A 318 



Piper, C. V 114 



Plant Breeding 87 



Plant Genesis, Studies of 114 



Plants, Growth of 55-57 



Pollen Tubes, Colloidal Phenomena in Proto- 

 plasm of 67 



Pollination, Experimental 293 



Pond, Clara P 125 



Potassium and Sodiimi, Effect on Hydration 



and Growth 67 



Potato Hybrid 87 



hotter, Frederick A 158 



Power, A. D 248, 249 



Poyer, John M 150 



Preiser, Samuel A., Publication by 36 



Publication on Neurofibromatosis 126 



President of the Institution, Powers and 



Duties of xrv 



President of Institution, Report of 5-40 



Pritchett, Henry S in, iv, 3, 44 



PAGE. 



Proper Motions, Measurement and Paral- 

 laxes of 200 



Protoplasm, Growth Mechanism of 57 



Publications Authorized and Issued during 



Year 27 



Publications of Eugenics Record Office. . . 123-125 

 Publications of Department of Terrestrial 



Magnetism 259-268 



Publications, Growth and Extent of 29 



Publications of Nutrition Laboratory 225-232 



Publications, Sales of 29 



Pueblo Indians of the Southwest 145 



Pulfrich, C 266 



Real Estate and Equipment, Schedule of . . . 52 



Receipts and Disbursements for 1918 48 



Receipts and Disbursements of Institution 



from Organization to Date 45 



Receipts and Expenditures of Institution to 



Date, Summary of 24 



Report of Executive Committee 41-45 



Report of President of Institution 5—40 



Researches of the Year 20 



Research Information Service 181 



Resolution, Vessel 262 



Respiration Apparatus and Breathing Appli- 

 ances for Human Subjects 223 



Respiration Chamber for Treadmill Observa- 

 tions 220 



Respiration Rates of Samoan Alcyonaria .... 164 



Richards, H. M 85 



on Acidity of Certain Mesophytic and 



Succulent Forms of Plants 64 



on Gas Interchange in Certain Succu- 

 lents 63 



Publication by 37 



Richards, Theodore W v 



Chemical Investigations of 279-284 



Publications by 37, 40 



Richmond, Myrtle L 188 



Riddle, Oscar 103, 109 



Publications by 34, 35, 37 



Report of Investigations of 104 



Ritchey, George W 187, 216 



Publication by 37 



Rolph, F. W 221 



Root, Elihu in, iv, x, xi, 3, 46 



Chairman of Board of Trustees 43 



Root-growth in Desert Plants and Oxygen 



Supply of the Soil 81 



Root Habits, Modification of 83 



Root Systems, Ecology of 291 



Rosonoff, A. J., on Reply to Criticism of 

 Recent American work by Dr. Heron, 



of the Galton Laboratory 123 



on Study of Heredity in the light of the 



Mendelian Theory 123 



Preliminary Report of a Study of Hered- 

 ity in Insanity in the light of the 



Mendelian Laws 123 



Roth, Paul 221 



on the Effects of a Prolonged Reduced 



Diet on Twenty-five College Men. . 225 



Publications by 32, 37 



Roy, Arthur J 179, 180 



Publication by 37 



Rubber Producing Plants 297 



Riicker, Arthur 243 



