http://en.wikipedia.org/wiki/Turtles_all_the_way_downThe most widely known version appears in Stephen Hawking's 1988 book A Brief History of Time, which starts:
“A well-known scientist (some say it was Bertrand Russell) once gave a public lecture on astronomy. He described how the earth orbits around the sun and how the sun, in turn, orbits around the center of a vast collection of stars called our galaxy. At the end of the lecture, a little old lady at the back of the room got up and said: "What you have told us is rubbish. The world is really a flat plate supported on the back of a giant tortoise." The scientist gave a superior smile before replying, "What is the tortoise standing on?" "You're very clever, young man, very clever," said the old lady. "But it's turtles all the way down!"”
It is possible that the lady's comment came after Russell's 1927 lecture Why I Am Not a Christian. In it, while discounting the First Cause argument intended to be a proof of God's existence, Russell comments:
“If everything must have a cause, then God must have a cause. If there can be anything without a cause, it may just as well be the world as God, so that there cannot be any validity in that argument. It is exactly of the same nature as the Hindu's view, that the world rested upon an elephant and the elephant rested upon a tortoise; and when they said, "How about the tortoise?" the Indian said, "Suppose we change the subject."”
The origins of this story are uncertain. In J. R. (Haj) Ross's 1967 linguistics dissertation, Constraints on Variables in Syntax, the scientist is identified as the Harvard psychologist and philosopher William James. Of the story's provenance, Ross writes:
“I have been unable to find any published reference to it, so it may be that I have attributed it to the wrong man, or that it is apocryphal. Be that as it may, because of its bull's-eye relevance to the study of syntax, I have retold it here.”
Additionally, Stephen Fry, in an episode of the BBC's comedy-quiz show QI (Series 1, episode 2), attributes the turtles anecdote to an exchange between an elderly lady and William James. Also, David Sloan Wilson does the same in his book Evolution for Everyone (Delacorte, 2007): 133.
Philosophical allusion to the story goes back at least as far as John Locke. In his 1690 tract An Essay Concerning Human Understanding, Locke compares one who would say that properties inhere in "substance" to the Indian who said the world was on an elephant which was on a tortoise "but being again pressed to know what gave support to the broad-backed tortoise, replied — something, he knew not what."
Henry David Thoreau, in his journal entry of 4 May 1852, writes:
“Men are making speeches… all over the country, but each expresses only the thought, or the want of thought, of the multitude. No man stands on truth. They are merely banded together as usual, one leaning on another and all together on nothing; as the Hindoos made the world rest on an elephant, and the elephant on a tortoise, and had nothing to put under the tortoise.”
This quote also appears in Robert Anton Wilson's Prometheus Rising; he attributes the story to William James:
“William James, father of American psychology, tells of meeting an old lady who told him the Earth rested on the back of a huge turtle. "But, my dear lady," Professor James asked, as politely as possible, "what holds up the turtle?" "Ah," she said, "that's easy. He is standing on the back of another turtle." "Oh, I see," said Professor James, still being polite. "But would you be so good as to tell me what holds up the second turtle?" "It's no use, Professor," said the old lady, realizing he was trying to lead her into a logical trap. "It's turtles-turtles-turtles, all the way!"
:hi: