“The conflict of theories, leading, as it eventually must, to the survival of the fittest, is advantageous.”

“The conflict of theories, leading, as it eventually must, to the survival of the fittest, is advantageous.”

“The conflict of theories, leading, as it eventually must, to the survival of the fittest, is advantageous.”

“Knowledge of Nature is an account at bank, where each dividend is added to the principal and the interest is ever compounded; and hence it is that human progress, founded on natural knowledge, advances with ever increasing speed.”