Pennsylvania Parties.--We earnestly solicit the attention of our readers, of every party, to the address from the Society of Constitutional Republicans to the people of Pennsylvania; commenced in the first page of this day's Ledger. While for elegance of writing and strength of declamation it may vie with any thing perhaps ever written in this country; it will lay open to the friends of political truth and sound federal policy, the true characters, the true objects, of those patriots by whom the administration of 1800 was overturned; by whom the constitution of our country has been assailed, beaten down, and trampled upon; by whom the energies of our government have been, in a great degree, extinguished. It will exhibit, in genuine colours, the principles and motives of those whose constant cry is the sovereignty, the inviolability, and the invincibility of the People. It will shew that all the civism of those clamourous friends of true Republicanism, those exclusive patriots, and disinterested politicians, centres in self: in the gratification of social ambition or avarice; in the possession of offices; of which none are too high for their vanity, nor too mean for their cupidity.--It will shew the truth of every syllable that has been urged against them by Federalists. The address is (perhaps justly) attributed to Alexander J. Dallas, than whom none was more deeply read in the councils of Democracy, alias Genuine Republicanism; none more actively employed in promoting its success: as the columns of the Aurora can sufficiently testify. When he, therefore, undertakes to depict the character of a party of which he was a chief, by which he was in a manner idolized, whose secret springs and motions are all intimately known to him. we naturally look for strong traits of its depravity; and we are not disappointed. Though we do not throughout, approve of the principles of the society of Constitutional Republicans, yet as contending against the most bold and infamous attempt, to over-turn the political institutions of the United States, that has ever yet been made, we cannot but pray for its success.--It is not with Pennsylvania that the evil will stop--if successful in its first essay, we may soon see the contagion of its example spread itself through every State of the Union, and must expect to behold its poisonous influence blight our every prospect of political security and happiness.