552 HUMAN BIOLOGY 



phenomena of human group biology has been achieved 

 man can do something effective about purposefully altering 

 some of its elements, if he then still desires to do so. 



REFERENCES 



Carr-Saunders, a. M. 1922. The Population Problem. Oxford, Clarendon 



Press. 

 Dublin, L. I. (Ed.) 1926. Population Problems in the United States and 



Canada. Boston, Houghton Mifflin. 

 East, E. M. 1923. Mankind at the Crossroads. N. Y., Scribners. 



1927. Heredity and Human Affairs. N. Y., Scribners. 

 Farr, W. 1885. Vital Statistics: A Memorial Volume of Selection from the 



Reports and Writings of William Farr, m.d., d.c.l., c.b., f.r.s. Ed. by 



Noel A. Humphreys. Lond. 

 Lotka, a. J. 1925. Elements of Physical Biology. Bait., WiUiams and Wilkins. 

 Malthus, T. R. Essay on the Principle of Population as it Affects the Future 



Improvement of Society. (The Everyman Library edition, which is a 



reprint of the seventh edition of the original work, is perhaps the most 



easily available.) 

 Pearl, R. 1924. Studies in Human Biology. Bait., Williams and Wilkins. 

 1925. The Biology of Population Growth. N. Y., Knopf. 

 1927 (a). Differential fertility. Quart. Rev. Biol. 2: 102-118. 

 1927 (6). The growth of populations. Ibid., pp. 532-548. 

 Rivers, W. H. R. (Ed.) 1922. Essays on the Depopulation of Melanesia. 



Cambridge Univ. Press. 

 Sweeney, J. S. 1926. The Natural Increase of Mankind. Bait., Williams and 



Wilkins. 

 Yule, G. U. 1925. The growth of population and the factors which control 



it. J. Roy. Stat. Soc, 88: 1-58. 



Paul B. Hoeber, Inc., 76 Fifth Avenue, New York 



