Mr. Breckinridge's Advice

-Th dietinguiühtíd gentlomsn is undsrstcod to have draWD up au a.ldreps to the borcUr slaveholding States, calliog fur a convsntion reprosenting thein, to be hold ii Ualtiniore, in February, for tlie consideratiou üf their dut}' t thumseivos, and Iiomt to preserve tho Uoufodorscy in the curreot orisis. It is suid to liare beeu sijjned already by íill the Senntors from thue States, and vviü duubtless bo aigned to day by all their Ropresen tatitos in tho lowar Heuse. Thi culi leavcs it to the authoritieg of the said States how to nppoint their representatives to the proposod eonTention. Thi important and now apparently so presshigly needed cali will iooa bo published, iro approhend,