SALEM, April 19. Extract oj a letter from Londoi:, Dcccjnbcr 21, I 79°' DF. A r SI R, << "J\ T"V heart rejoices at the present happitiefs IVJL and future profjieifts ot your country. Every thing combines to eftablifli in Europe a juit ideaofyour inci easing respectability. 1 herevival of punctuality in public and private engagements is a lure evidence of the wisdom and energy of your National Government. —We have felt anxi ous for the fa:c of your political (hip, tofled a bour as flic has been without a captain or pilot, without rudder or compass-—happily, howevi, 110 llorins overtook her in that unprepared (late, and she now holds a right course for the haven of fafety. Great are the expectations of the wife and the good from the advantages you pof fefs ; they hope you will exhibit the fail ex ample of a people who (hall make the enjoyment of life consist in fulfilling its duties, and who will look for social benefits only in the piatftice of social virtues—They flatter themlelves that the period is commenced, when the superiority of nations is to be marked by the productions of indullry instead of the ruins of war—when a peo ple will be distinguished for what they enjoy in itead of what they facrilice.—America lias the merit of opening this new field : I pray to Hea ven that flie may neither mar its cultivation nor despoil its fruit! May fhc be willing that the fub fiitence and comforts of life (hall be distributed in the cheapest manner and enjoyed universally ; and for this purpose I pray that (he may avoid those reftri»ftive and partial systems of commer cial legislation whichimpoverilh the people they are intended to favor, and only provoke those they are intended to punish. 1 his left-handed policy, which disgraces Europe, can never be approved by the poor man's friends. The scan ty pittance of the poor in all countries is made Hill scantier by this abule of power; itcannot therefore (without very strong reasons indeed) be praiTtifed among you by those who unite kind est hearts with wife heads. The interests of nations are not often incom patible, tho they are commonly considered so by those who have the guidance of them. It is a wretched error to estimate the wealth and opu lence of a people by the comparative poverty of other nations. However just such a mode ot cal culation may be for estimating power, nothing can be more abl'urd in estimating wealth. But what absurdity is so great as to be without its ad vocates among those who are called wife ? Even Agriculture, Manufactures and Commerce, which are indispensably neceflary to aWift and support each other, are frequently treated as rivals— fotnetimes as enemies. If your country is wil ling to profit by the niiftakes of others, you will conduifl these things better than they have been conducted here—and yet I am so much an En glilhman in my prejudices as tobelieve that their several interests have been less frequently injured, and more frequently promoted by the interference of government in England than in other coun tries ; but be This as it may, it is now a prime ar ticle in the political creed of our ablest dosftiors, that the hand of labour is misguided by'the inter ference of government ojtemr than it is directed to any valuable purpose—They admit that an ufeful art or branch of commerce unpratftifed and un known in a country may deserve and require pub lic assistance to introduce it—but tho there are ca ses in which government maya;