FUOB NEW YOftK.Correspondence of the Pittsburgh Gazette.* New Yokx, May 29.The city baa been in a complete state of “collapse” tbi« afternoon, in consequence of the exhibition of a lump of gold, valued at 52,000,brought by Lieut. JBeale, from California. The moat sceptical have given in their adhesion to the gold mania, and he is a bold man who has many doubts now. The Crescent City will bring the metal brought by the aiatuera to Panama, and un* Ul then we hold our breath at the immense stones told of the wealth of oor western province, or colony rather.