Birth is regularly expressed by some connection with water: we are plunging into or emerging from water, that is to say, we give birth or are being born. Now let us not forget that this symbol has a twofold reference to the actual facts of evolution. Not only are all land mammals, from which the human race itself has sprung, descended from creatures inhabiting the water—this is the more remote of the two considerations—but also every single mammal, every human being, has passed the first phase of existence in water—that is to say, as an embryo in the amniotic fluid of the mother’s womb—and thus, at birth, emerged from water. I do not maintain that the dreamer knows this; on the other hand, I contend that there is no need for him to know it. He probably knows something else from having been told it as a child, but even this, I will maintain, has contributed nothing to symbol-formation. The child is told in the nursery that the stork brings the babies, but then where does it get them? Out of a pond or a well—again, out of the water. One of my patients who had been told this as a child (a little count, as he was then) afterwards disappeared for a whole afternoon, and was at last found lying at the edge of the castle lake, with his little face bent over the clear water, eagerly gazing to see whether he could catch sight of the babies at the bottom of the water. In the myths of the births of heroes, a comparative study of which has been made by O. Rank—the earliest is that of King Sargon of Akkad, about 2800 B.C.—exposure in water and rescue from it play a major part. Rank perceived that this symbolizes birth in a manner analogous to that employed in dreams. When anyone in his dream rescues somebody from the water, he makes that person into his mother, or at any rate _a_ mother; and in mythology, whoever rescues a child from water confesses herself to be its real mother. There is a well-known joke in which an intelligent Jewish boy, when asked who was the mother of Moses, answers immediately: “The Princess.” He is told: “No, she only took him out of the water.” “That’s what _she_ said,” he replies, showing that he had hit upon the right interpretation of the myth.