(Special to New York Herald.)

Madrid, April 12, 1873.

The American Ambassador, Gen. Sickles, has formally notified Senor Castelar that the American Government will consent to the surrender to the British Government of Bidwell, now under arrest in Havana upon charge of being concerned in the Bank of England forgery.

(Special to New York Herald.)

London, April 12, 1873.

To the great gratification of the authorities here, official confirmation is given to the rumor that the Spanish Government has concluded to grant the extradition of Bidwell, now under arrest in Havana. There seems to be no doubt that Bidwell is the mysterious Frederick Albert Warren, and there is a very general curiosity to see him. Many conflicting stories have been published of his extraordinary escape and equally extraordinary capture. The Times' report had it that he was mortally wounded, and that he had on his person when captured diamonds to an enormous value, which had disappeared soon after. Sergeants Hayden and Green of the Bow Street force and Mr. Good of the bank of England sail on the Java to-morrow to escort Bidwell to London.

So the web was closing in on me. Of my daily sad interviews with my wife I will say nothing here. But could I have foreseen that this woman, on whom I had settled a fortune, would have married another soon after my sentence, I should not have felt so sorrowful on her account. In due time Green, Hayden and Good arrived, and were introduced to me. I did not give in, but made, by the aid of my friends, a hard fight to persuade the Captain-General to suspend the order for my delivery, and succeeded for a time.

At last, after many delays and many plans, early one May morning I was taken to the mouth of the harbor. There the boat of the English warship Vulture was in waiting, and I was formally transferred to the English Government, and Curtin. Perry, Hayden and Green went on board with me. Soon after she steamed out of the harbor. Later in the day the Moselle, the regular passenger steamer to Plymouth and Southampton, came out, and about ten miles out at sea was met by the Vulture's boat, and I and my four guardians were transferred to her.

At last I was off for England, and it looked very much as if Justice would weigh me in her balance after all, the more certainly because I found my wife on the Moselle. I had secretly resolved never to be taken back, but intended the first night out of Havana to jump overboard, possibly with a cork jacket, or something to help to keep me afloat. The waters of the gulf were warm, there were many passing ships, and I would take my chance of surviving the night and being picked up. But, very cleverly, Curtin decided to send my wife with me and treat me like any other cabin passenger, rightly divining I would not kill her by committing suicide or going over the side on chances.

I was well treated all the way over, but every night my prayer was that we might run on an iceberg or go down, so that my wife might be spared long years of agony and me from the misery and degradation of prison life.