Brevet General GEORGE TALCOTT, of the Ordnance Department has been tried by a Court Martial for violation of the regulations of the Department, for disobedience of orders and instructions; and for conduct unbecoming a gentleman. He was found guilty of all the charges, and upon all the specifications with two exceptions, and by sentence of the court, with the approval of the President of the United States, has been dismissed from the service. MR. CHARLES L. BRACE, the "Pedestrian Correspondent" of the _Independent_ newspaper has been arrested at Grosswardein, in Transylvania, upon a charge of complicity in some democratic plots. The only evidence against him seems to be his having letters of introduction which were thought suspicious, and being in possession of a copy of Pulzky's "Rights of Hungary." Mr. Brace is a young man of decided literary talent, who has been for many months performing a pedestrian tour through Europe for the purpose of learning by personal inspection the condition of the people. His letters from Europe are among the most valuable that have been published in this country. He is the writer of an appreciative and thoughtful critique upon Emerson which appeared some months since in the _Knickerbocker_ Magazine. The London _Economist_, in noticing the translation of the "History of the Colonization of America" by _Talvi_ (Mrs. Robinson), gives some information in respect to the author which will be new upon this side of the Atlantic. It says that "Mr. Talvi gives a succinct and carefully compiled history of the event, which will be acceptable to many readers. He is a German, probably settled in the States, and his book displays the pains-taking character of his countrymen." Mr. B. A. GOULD, of Cambridge, Mass., has received a tender of the appointment of Professor of Astronomy at the University of Göttingen, vacated by the recent death of Dr. Goldschmidt.