Whereas the Massachusetts Board of Agriculture, at its meeting held in Boston, January 14, 1852, requested its President to enter into correspondence with the Presidents of Stale and other Agricultural Associations on the expediency of calling a National Agricultural Convention: - and whereas the Pemislyvania Stale Agricultural Society, at its meeting as Hnrrisburgh on the 20th of the same mouth; and the Maryland State Agricultural Society, at its meeting in Baltimore, on the 4th of February, adopted similar tesolutions, and recommended the formation of a National Agricultural Society; - und whereas the New-York, Ohio and other Slate Societies, through their Presidents or by published Resolves, have expressed similar views in relation to the necessity or a closer bond of union between all such institutions throughout our comilrv:

Therefore, the undersigned, believing from these indications that the time has arrived for a confederation of local Agricultural Societies in the United States, and in conformity with a Resolution of the Pennsylvania Society, authorizing the Presidents of the three first named Associations to designate time and place, - do hereby invite Delegations to meet in Convention in the city of Washington, on the 24th day of June next, at 10 o'clock. A. M.

The objects of this Convention are to organize a National Agricultural Societt, to which the various Agricultural Societies may be auxiliary; to consult together upon the general good, and to establish, by this Society, or such other means as the Convention may devise, a more cordial and widely extended intercourse between agriculturists in our own country and in other lands, to create additional facilities for the acquisition and diffusion of knowledge, by books, journals, seeds and other objects of interest to the American farmer and gardener; and to act on such other matters pertaining; to the advancement of agriculture as the wisdom of the Convention may judge appropriate.

For these purposes the undersigned earnestly solicit delegations from the various Slate, or other organizations, for the promotion of agriculture in the several States ana Territories; and where such organizations do not exist, delegations from such districts,consisting in all cases of such number of persons as may be deemed expedient to appoint.

As it has been considered desirable to name an earlier day for this Convention than was at first expected, this circular is issued before the concurrence of the several State Agricultural Societies could be obtained. Their respective Presidents are therefore requested to add their names to this call, and to give immediate publicity to the same through the papers and periodicals of the day.

A large and general attendance is confidently anticipated.

Societies will please transmit at an early dale a list of the delegates they have appointed, to Daniel Lee, M. D., Agricultural Deportment, Patent Office, Washington.

The ntove call is signed by Marshall P. Wilder, Prest. Muss. Board of Agr - Frederick Walts, Prest. Penn. S. Ag. Society - Chas. B. Calvert, Md. do. - Henry Wager, N. Y. do. - Thomas Stocks, South. Cell. Ag. Society - Arthur Wans, Ohio S. B. of Ag. - James Tollmndge, Am. In., N- Y. - Johu C. Gray, Mass. Society Prom. Ag - Joseph A. Wright, Ind. S. Ag. Society - Geo. A. Nesmith, N. H. do. - Frederick Holbrook, Vt. do. - Josiah Cbapin, R. I. Sue. for the Encouragement of Domestic Industry.