Manhood of Humanity.

permission to quote from “Organism as a Whole” and “Physiology of the Brain,” by Jacques Loeb. Messrs. Harper & Brothers, for permission to quote from “From the Life, Imaginary Portraits of Some Distinguished Americans,” by Harvey O'Higgins. Messrs. D. Appleton & Company, for permission to quote from “Corporation Finance,” by E. S. Mead. Messrs. J. B. Lippincott Company, for permission to quote from “Forced Movements,” by Jacques Loeb. Princeton University Press, for permission to quote from “Heredity and Environment,” by Edwin Grant Conklin. Columbia University Press, for permission to quote from “The Human Worth of Rigorous Thinking,” by C. J. Keyser. The Rockefeller Institute for Medical Research, for permission to quote from The Journal of Experimental Medicine , Vol. 27. The New School for Social Research, for permission to quote from “An Outline of the History of the Western European Mind,” by James Harvey Robinson. The Engineering Magazine Company, for permission to quote from “Mastering Power Production,” by Walter N. Polakov. [pg ix] Preface This book is primarily a study of Man and ultimately embraces all the great qualities and problems of Man. As a study of Man it takes into consideration all the characteristics which make Man what he is. If some readers do note the absence of certain expressions familiar to them, it does not mean that the author does not feel or think as many other people—he does—and very much so; but in this book an effort has been made to approach the problem of Man from a scientific-mathematical point of view, and therefore great pains have been taken not to use words insufficiently defined, or words with many meanings. The author has done his utmost to use such words as convey only the meaning intended, and in the case of some words, such as “spiritual,” there has been superadded the word “so-called,” not because the author has any belief or disbelief in such phenomena; there is no need for beliefs because some such phenomena exist, no matter what we may think of them or by what name we call them; but because the word “spiritual” is not scientifically defined, and every individual understands and uses this word in a personal and private way. To be im personal the [pg x] author has had to indicate this element by adding “so-called.” I repeat once again that this book is not a “materialistic” or a “spiritualistic” book—it is…