The St. Louis Democrat says;—" We published a statement made by the Louisville Courier, a few days ago, that the deepest well ia the world was the artesian well of Messrs. Dupont, in that city—1,900 feet in depth. We beg leave to inform the Courier that the artesian well'of Belcher & Bro's., in this city, is now 2,200 feet deep, being 300 feet deeper than that of Messrs. Dupont. It will be carried to a still greater depth, until such water as can be used for refining purposes, in the Messrs. Belcher & Bro's. sugar refinery, shall have been reached."