THE ASSASSINS.
Rumors of Their Arrival at Montreal
There are rumors about the rebel assassins being here. It is said that Surratt came on Wednesday and left last night. The name of the Southerner in whose house he was is even mentioned. The raiders discharged in Toronto were here last week.

Arrest of Junius Brutus Booth.
Philadelphia. Wednesday, April 26.
Junius Brutus Booth was arrested in this city at eight o'clock this morning, and taken to Washington, where he is now confined in the Old Capitol Prison.

It is understood that his arrest was caused on suspicion of his knowledge of the intention of his brother to assassinate President Lincoln, based upon his letter to Wilkes, published in yesterday morning's papers, regarding Richmond and oil.