266 BIBLIOGRAPHY 



PEARL R. and REED, L. J. On the rate of growth of the population of the 



United States since 1790 and its mathematical representation. Proc. 



Nat. Acad. Sci. Vol. VI, pp. 275-288, 1920. 

 PEAKSON, K. Mathematical contributions to the theory of evolution. 11. 



Skew variations in homogeneous material. Phil. Trans. Roy. Soc. 



Vol. CLXXXVI, Ser. A. pp. 343-414, 1895. 

 PEAKSON, K. The Chances of Death and other Studies in Evolution. 



2 vols. London, 1897. 

 PEARSON, K. The Grammar of Science, Second Edit. London 1900, pp. 



22 and 23. 

 PEARSON, K. On the change in expectation of life in man during a period 



of circa 2000 years. Biometrika, Vol. I, pp. 261-264, 1902. 

 PEARSON, K. The Scope and Importance to the State of the Science of 



National Eugenics. Third Edit. London (Cambridge Univ. Press), 



1911, pp. 45. 



PEARSON, K. The Groundwork of Eugenics. Second Edit. London (Cam- 

 bridge Univ. Press), 1912, pp. 39. 

 PEARSON, K. Nature and Nurture the Problem of the Future. Second 



Edit. London (Cambridge Univ. Press) 1913, pp. 31. 

 PEARSON, K. The check in the fall in the phthisis death-rate since the 



discovery of the tubercle bacillus and the adoption of modern treat- 

 ment. Biometrika, Vol. 12, pp. 374-376, 1919. 

 PLOETZ, A. Lebensdauer der Eltern und Kindersterblichkeit. Arch f. 



Rassen- und Gesell- Biol. Bd. 6, pp. 33-43, 1909. 

 PRITCHETT, A. S. A formula for predicting the population of the United 



States. Quart. Publ. Amer. Stat. Ass. Vol. II, pp. 278-286, 1891. 

 RICHARDS, H. A. A study of New England mortality. Quart. Publ. 



Amer. Stat. Assoc. Vol. II, pp. 636-646, 1909 (NS. No. 88). 

 RITTER, W. E. The need of a new English word to express relation in 



living nature. Jour. Phil. Psych, and Sci. Meth. Vol. 18, pp. 1-18 (of 



reprint), 1921. 

 ROBERTSON, T. B. and RAY, L. A. Experimental Studies on Growth. XII. 



The influence of pituitary gland (anterior lobe) tissue, tethelin, egg 



lecithin and cholesterol upon the duration of life of the white mouse. 



Jour, Biol. Chem. Vol. XXXVII, 427-442, 1919. 

 ROBERTSON, T. B. and RAY, L. A. Experimental Studies on Growth XV. 



On the growth of relatively long lived compared with that of relatively 



short lived animals. Jour. Biol. Chem. Vol. XLII, pp. 71-107, 1920. 

 ROMEIS, B. Zur Verjiingungshypothese Steinachs. Munch, med. Wchn- 



schr. 1921, No. 20. 

 ROSE, W. Field experiments in malaria control. Jour. Amer. Med. Assoc. 



Vol. 73, pp. 14141420, 1919. 



