[35] The closing reflections are borrowed from _The Leaflet_, issued by the students of the New School for Social Research, established in New York in 1919, with a view of encouraging adults to continue their studies in the general spirit and mood which permeate this essay. APPENDIX SOME SUGGESTIONS IN REGARD TO READING It may happen that among the readers of this essay there will be some who will ask how they can most readily get a clearer idea of the various newer ways of looking at mankind and the problems of the day. The following list of titles is furnished with a view of doing something to meet this demand. It is not a bibliography in the usual sense of the term. It is confined to rather short and readily understandable presentations appropriate to the overcrowded schedule upon which most of us have to operate. All the writers mentioned belong, however, to that rather small class whose opinions are worth considering, even if one reserves the imprescriptible right not to agree with all they say. There may well be better references than those with which I happen to be acquainted, and others quite as useful; but I can hardly imagine anyone, whatever his degree of information, unless he happens to be a specialist in the particular field, failing to gain something of value from any one of the volumes mentioned. For the astounding revelations in regard to the fundamental nature of matter and the ways in which the modern chemist plays with it, see John Mills, _Within the Atom_ (D. Van Nostrand Company), and Slosson, _Creative Chemistry_ (The Century Company). A general account of the evolutionary process will be found in Crampton, _The Doctrine of Evolution_ (Columbia University Press), chaps, i-v. For our development as an individual from the egg see Conklin, _Heredity and Environment_ (Princeton University Press). The general scope of modern anthropology and the influence of this study on our notions of mankind as we now find it can be gathered from Goldenweiser, _Early Civilization, Introduction to Anthropology_ (Knopf). This should be supplemented by the remarkable volume of essays by Franz Boas, _The Mind of Primitive Man_ (Macmillan).