Position Of Great Britain And France

In tlio l'hiladelphia Press of Mouday moruing we imd the following letter : Washington, April 20, 1SG1. It is Btötfcd, by the best authority, that Lord Lyons, the Britisl) Minister, sent a i' to dcta-in the steamer persia ai New York until full diapatohei could be forwarded by him to the Homo (jtoveriiinout. Lord Lyous is advisod, I understai;d, to proffer to the Uuited States Government, tor the suppression ut' the Slave Slato lleb;llion, anus, amniunitioii and troops frora Eugland and Ctmada liy the Persia he sent out orders lor 300,000 stand of the mproved Minie musktt, and ft)r u vast nuniber of the celebraiod rifled camión. Orders, in future, are not to bo fillcd in Englaud for the Rebel OoverDment for arins, ammuniti"'ii or sliiiis sf war. It is belioved tliat an English and Freuch floet will bo sent to the Southern porta si an carly day, to co-operate witli the United States Heet in the blockadc if the Öecession porta Loui.s Napoleon basjjained with Victoria to süppress the Slüve State rebelüon. It is stated that lus off' r.s of serviue to Presidmit Lincoln are DOW on the way to Washii gtop, It is hoped hen1, that Yancey and his coufede'rafe traitors will bo seiz.;d by Franco and Rusland and sent tothe United otates to be tried and hung uudor the extradition treaties. Orden have been issued, it is reported, to the (iovernor General of Cánida, t offer to the United States men and anus.