Nihil de vitello.

But where is the yolk, was used to be said to persons reserving to themselves the best part of any viands, or other things, of which they had the distribution. A man dreamed he had found an egg. A soothsayer who was consulted to interpret the dream, told him that it portended he should find a treasure, the white of the egg representing silver, the yolk gold. The event corresponding with the prediction, the man took to the seer, some of the pieces of silver; but what, said the seer, is become of the yolk? Which thence became proverbial.