When the wisest of the seven wise men of Greece was asked to name some happy person, he cited several, all of whom were among the dead. “And do you know none living who is happy?” queried his royal host, who had expected his own name to be mentioned among the fortunate few. “Call no man happy,” replied the sage, “until he is dead.” He forgot not that in the temples of his native land, Tyche, Goddess of Chance, was represented holding in one hand a rudder, for it is she who guides the affairs of men; but in the other hand a sphere, to warn of the instability of her favors. Like the King of Lydia, most of her modern votaries remember her former but forget her latter attribute. Science preaches that the progress of thought has been from a time when Caprice and Chance were deemed everything in nature and Law was nothing, to the present day, when Law is known to be everything and Caprice and Chance are nothing. Science may preach till it is hoarse, but there is something in the human mind ever insisting that the ancient Goddess, or some other inscrutable fatality, coerces the history of the individual; and that, from his birth, luck, good or bad, merriment or melancholy, marks him for her own. Rarely have I asked a man of large experience who denied the mighty influence of the unforeseen and unforeseeable in practical affairs. Some of the most extensive enterprises are based on the recognition of this truth, and it is mathematically demonstrable; for mathematicians are prepared to show that disorder itself is orderly, and that the vagaries of chance are bound by laws, and pinned in a straight jacket of formulas. But what their apparatus of signs and symbols does not show, where it completely breaks down, is precisely the only point of human interest in the whole matter,――in its application to the individual life and fortunes. Averages and general laws they give us; but it is also a mathematical law that the average is never applicable to the individual. What is true of the whole series is never true of any one member of the series. No man who insured his life ever died at the precise minute which, according to the actuary’s tables, terminated his calculable expectation of life. Let us see what, from this point of view, these computations about luck or chance teach. In mathematics they are included in the Calculus of Probabilities, the discovery of which is attributed to Pascal. A gambling nobleman asked him what are the chances of turning a red or black card in cutting the pack a given number of times. As all the cards are either red or black, Pascal replied that it would be expressed by the formula x/2. In ordinary language, this means that when two events are equally probable, they will occur equally in the long run; and in practical affairs, when we neither know nor suspect things are unequal, we must assume them to be equal.