Mr. Buchanan, by d-irection of tbe President, sent dispalches by tÃie sÃeart. er of the lst inst. addressed to our minister at London, directing him to give Lord Aberdeen the year's nolice, providing for the tcrmination of the joint occupntjon. Mr. Buchanan has also given official information of tho fact to Mr. Packenharo, ÃtThe New Orleans seers are gifted with splendid visions of ihe future. The Tropic of the 8tli says:: t:Yc were talking yesferday with an officerof one Ã¶f our voÃ¯untÃ¨er corps, and I e inforined us tliat there wns not a man n liis regiment Ãml'knewany Ãhing about Zeography, or any dijerance Heliicen the sois casi or iccsl of the Rio Grande.We hear ofnew Rcpublics spoken ofÃii' Mexico, and -ve w two cundidales for Gpvemors for these new Rcpublics. - riieevents of the future open with singular ningnificenre." (Ã A subscription is opening ir Deiroit fyr a Company of Volunteer Riflemen, to serve in the armv 12 tnonths. - rhey musÃ be (rom 18 to 35 years of sge.