as to the role played by revolution in social development.
If in spite of these facts such conclusions are still insisted upon, then we can reply to them with a very popular and familiar illustration, which demonstrates in an unmistakable manner that nature does make sudden leaps: I refer to the act of birth. The act of birth is a leap. At one stroke a fetus, which had hitherto constituted a portion of the organism of the mother, sharing in her circulation, receiving nourishment from her, without breathing, becomes an independent human being, with its own circulatory system, that breathes and cries, takes its own nourishment and utilizes its digestive tract.
The analogy between birth and revolution, however, does not rest alone upon the suddenness of the act. If we look closer we shall find that this sudden transformation at birth is confined wholly to functions. The organs develop slowly, and must reach a certain stage of development before that leap is possible, which suddenly gives them their new functions. If the leap takes place before this stage of development is attained, the result is not the beginning of new functions for the organs, but the cessation of all functions—the death of the new creature. On the other hand, the slow development of organs in the body of the mother can only proceed to a certain point, they cannot begin their new functions without the
