INDEX. 



XXVll 



Mountains, Origin of Laccolitic, viii 

 Munro, Propylene Glycol Dinitrate, vi 

 Murphy, Humboldt Current on ma- 

 rine life, V 



N 



Newbold, The Roger Bacon cipher, v 

 Nitrogen and chlorine, in flaming arc, 



vi 

 Noguchi, Recent researches on yellow 



fever, x 

 Normal and Pathological Processes, 



Electro-Chemical theory of, x 

 Noyes, Nitrogen and chlorine in a 



flaming arc, vi 



Oaks, black, unusual natural group, vii 

 Obituary notices : 43 



Rosengarten, Joseph G.. iii 



Jastrow, Morris, x 

 Officers Elected for 1921, iii 

 Osborn, Proteins of living plants, vi 



Scott, John, Medal, Presentation of, 

 xix 



Scott, Wm. B., The Isthmus of Pan- 

 ama and its influence on the animals 

 of North and South America, xxiii 



Sinclair, A New Hoplophoneus from 

 the Pipanotherium beds, viii, 96 



, Entelodonts from Big 



Bad Lands of South Dakota, viii, 

 467 



■, " Turtle Oreodon " or 



" Red Layer " of White River 

 Oligocene, vii, 457 



Snyder, Planck's constant ' h ' a vari- 

 able, ix 



, Volcanism and the cosmic atomic 



numbers, viii 



Star diameters, measurement, viii 



Stars, Photo-Electro-Photometry of, 

 ix 



Stebbins, Photo-Electric Photometry 

 of Stars, ix 



Stellar Distances, catalogue of. viii 



Stellar Parallaxes, mean relative, ix 



Panama, isthmus, influence on ani- 

 mals of North and South America, 

 xxiii 



Paton, Signs of insanit}', ix 



Pearl, Population growth, v 



Pease, Measurement of star diameters, 

 viii, 524 _ 



Phillips Prize, committee on, xi 



Planck's Constant ' h ' a variable, ix 



Plants, proteins of, vi 



Population, growth of, v 



Prize, Henry M. Phillips : Award, xi 



, Committee on. report 



of. xiii 



Propylene glycol dinitrate, vi 



R 



Radiation, production of. in Helium, x 

 Radium, another story about, iv 

 Richards, Einstein's theory of relativ- 

 ity, xxi 

 Roger Bacon cipher, v 

 Rose Atoll, Samoa and Sea Level, 62 



and viii 

 Rosengarten, Joseph G,, Obituary, iii 



Schlesinger,^ Catalogue of stellar dis- 

 tances, viii 



Schoflf, Early Methods of communi- 

 cation between China and the Med- 

 iterranean, V 



Tobit's Blindness and Sara's Hysteria, 

 X, 71 



Tennent, Relation between the chro- 

 matin and the nucleus and similar 

 materials in the cell body, vi 



Transportation problems, v 



Trees, growth of, 7 



Tree trunks, growth and other 

 changes, vii 



Trelease, Natural group of black 

 oaks, vii. 31 



Tuberculosis, hereditary influences on, 



X 



" Turtle-Oreodon " of White River 

 Oligocene, vii, 457 



Vision, intermittent at low intensities, 



viii 

 Volcanism, universal, and cosmic 



atomic numbers, viii 



W 



Webster, Problem of Steering an 

 automobile; Vibrations of gun bar- 

 rels, V 



Wright, Phillips Prize Essay, Control 

 of Foreign Relations, 99 



Yellow fever, recent researches on, x 



