We learn from the publishers, Jewett and Co., that the issue of Mrs. Stowe's "Key to Uncle Tom's Cabin," presenting the "Original Facts and Documents, upon which the story is founded," together with sundry "corroborative statements, verifying the truth of the work," is unavoidably deferred until Saturday next, the 16th inst. The publishers are sadly embarrassed by an unprecedented trouble, to wit, the impossibility of getting books enough manufactured to meet the orders already received, which amounted on Saturday last to 58,000 copies. The work makes a pamphlet of 262 very large 8vo pages, and it is to be sold at 50 cents, in paper covers. It is very evident that Uncle Tom without a key has opened the door for the general discussion of slavery as a condition of society, in its comparison with the state of things at the North and in England. The effect of the key will be to unlock every cabin, and open the gates of every plantation for a free and full investigation. Says the Southern Baptist, April 6:—Independent.

  "Mrs. Stowe's second book will consolidate the fortune gathered by the first. But it will have a different reception from that of the first. It claims to be a book of facts.—It will provoke rejoinders as such. As such it will receive the most searching investigation. If its statements cannot endure the test, the bubble reputation, which she now enjoys, will break even more rapidly than it was blown. If the statements are true, some of our people may look into the logic of her conclusions, and may undertake to show what the same kind of reasoning proves with regard to the North."