The last interchauge of dispatches between the British Government and Lhe State departmeut, says a Washington telegram, shows that extradition between the two comí tries is a daad-letter; i that Winslow and Gray and other Ame1icans in lingland who are under arrest there will be releaaed, and that to all intenta and purposes the treaty of Í842 may be considerad as abrogated. Olïieial infarmstion to that effect has been communicated to the Senate Committee on Foreign Relations, that it may take such steps as a coordínate brancli of the treaty-inaking power as it may dffeni proper, either in the way of suggesting to the President the tsrms of a new or supplemental treaty or to provide f or snch legislation as will meet the extrnordinary demaod of the British Government, ïhis ilemand is for an assurance in the case of Winslow, the Boston fulgor, f rom this Government, that ho hall not be tried for any crime other than for which he was extradited. His extra lition is asked for on an indictment for forgery. The English authorities declare that tliey wil surrender him if the United States will agree not to try him for ony other offense. The Secretary of State replies that the tenth article of the Extradition treaty reqnires no such cxact.ion and shows that both couutries have tried persons for crimes for which they were not extradited. To thia the other side make answer that an act of Parliamrnt of 1870 prohibits the snrrender of any criminal to a foreign country until assurance is received, by law or otherwise, that ho shall not be put 1 on trial for any other crime than that for which he is given up. This Government, in its reply, stands on tho treaty of 1842, and protests that it is no party to Üic act of Parliament of 1870, though it insista that the twentyseventh section of that act in effect simtains the extradition cluuse of the treaty. Aside from all these facts this Govornmeut in the Winelow case has no authority wliatever to pledge the conduct of criminal justico in Massachusetts to Great Britain. Wiaslow is to be tried, if tried at all, in the courts of that State, and notin the courts of the United States. No Federal oflicer can dictute to a attorncy nor a grand jury in Massachusetts the nature of the crime for which Winslow símil be tried. The position of the Secretary of State ia snstained by the leading men in botli parties at Washington who are acquniutod with the f acts, while on the other hand that of Great Britain is regarded as singular as it is untenable.