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. AN.-We are indebted to a friend for copy of the following letter, sent by the Hon James Buchanan, in reply to an invitation on the part of the Democratic citizens of Berks county, to ihe Harvest Home, which took place near Reading on Saturday last. IL is production that speaks for itself. Written on a most interesting subject, it will cons mand attention by the clearness and power with which that subjeots scuss- ed-a subject let us ado, which has as- sumed most serious, if not momen- tous aspect:

 WASHINGTON, Aug 25, lS47.

 GENTLEMEN: 1 have been honored by the receipt of your kInd invitation 10 unite with the Democracy o! O'd Beiks in their Harvest Home celebration, to be held al Reading, on Saturday, the 26 h inst. should esteem it bo,h pleasure and privilege to be present on that oc- cason it is, therefore, with regret have to inform you that my public duties du- ricg the presen. week will render this impossible.

 Irejoce to observe that the glorious Democracy of cod Berks' nre buck ling on their armor, and preparing for tae approaching contest. It is long since any State election has involved sucE. important consequences for the Democracy of the Union, as the ap- preaching election for Governor of Pean. sylvania. On its result may probably depend the ascendcncy of the Demo- cracy of the Union for years 10 come. Hence our Democratic brethren of other States are witnessing the contest win intense anxiety. The field is a fair one our candidate well-tried, able and hon est--and he has been regularly nomina. ted by the party. Should he be defeat. ed, the attempt will be vain 10 explain the decision of the ballot boxes in any other manner than by admitting that the Wings have the majority. Our candi, date for Canal Commissioner is also, above all reproach, both personally and politically, and is eminenIly qualified for ihe duties of that important office. Ii, under such circumstances, the D-mo. cratic Keystone should give way, there is great danger that the arch may ,um- ble into pieces. In this contest empha- ticaIly, he that is not for us is against us. do not apprehend defeat, unless our willy foe should first ull us into security by making no extraordinary public et- forts; and iher, at the eleventh hour, quietly steal march upon us, IS they have done in some other States. Our vigilance ought to be constantly on the alert, un,il the moment of victory.

 The question of slavery, in one of it's ancient aspects, has been recently revi- veG and threatens to convulse the coun- try. The Democratic party of ihe Union ought to prepare themselves in tune for the approaching storm. Their best security, in the hour of danger, is to cling fast to their time-honored piin- ciples A sacred regard for the Feeder al Constitution, and for the reserved rights of the States, is the immoyable basis on which the party alone can safely rest.-- This has saved us from the inroads of Abolition. Northern Democrats are not expected to approve of slavery in the abstract; but they owe it to lhcm- selves, as they value the Union, and all 