200.—Equitable estoppel (or estoppel by conduct, or in pais) is the species of estoppel which equity puts upon a person who has made a false representation or a concealment of material facts, with knowledge of the facts, to a party ignorant of the truth of the matter, with the intention that the other party should act upon it, and with the result that such party is actually induced to act upon it, to his damage. Bigelow, Estop. 484. And see