The Eighth Session of this institution will be held in the city of Philadelphia, commencing on the 11th of September next, at 10 o'clock A. M., and will be continued for several days.

This Society, the first National Institution for the promotion of Pomological Science, was organized in the year 1848. Its sessions have brought together the most distinguished cultivators of our country; its transactions have embodied the various researches and ripest experience, and its Catalogue of Fruits has become the acknowledged standard of American Pomology.

Its example has created a general taste for this science, inspired pomologists with greater zeal, and called into existence many kindred associations. Its progress has been remarkable and gratifying, but it still has a great work to perform. Its general catalogue should, from time to time, be enlarged and perfected, and local catalogues formed, embracing the fruits adapted to each State and Territory of the Union. The last of these suggestions was made by the Chairman of the General Fruit Committee, at the seventh session of the Society, in the year 1858. This has been carefully considered, and is deemed worthy of special attention. It is, therefore, earnestly recommended that each State Pomological, Horticultural, or Agricultural Society, charge its Fruit Committee with the duty of collecting information, and presenting the same, with descriptive lists of Fruits adapted to their location.

The importance of this subject, and the increasing value of the fruit crop of the United States, call for a prompt and cordial response to this request, for a careful preparation of said list, and for a full and able representation, at the approaching session, from all parts of the country.

The various State Committees of this Society are expected to submit accurate and full reports of the condition and progress of fruit culture, within their limits, together with definite answers to each of the following questions. These reports, it is desirable, should be forwarded to the Chairman of the General Fruit Committee, Hon. Samuel Walker, Roxbury, Mass., if possible, as early as the 1st of September, or to Thomas W. Field, Esq., Secretary, Brooklyn, New York.

What six, twelve, and twenty varieties of the apple are best adapted to an orchard of one hundred trees, for family use, and bow many of each sort should it contain? What varieties, and how many of each, are best for an orchard of one hundred trees, designed to bear fruit for the market?

What six and twelve varieties of the Pear are best for family use on the Pear stock? What varieties on the Quince stock 1 What varieties, and how many of each of these, are best adapted to a Pear orchard of one hundred or of one thousand trees?

What are the six and. twelve best varieties of the Peach? What are the best varieties, and how many of each, are best adapted to a Peach orchard of one hundred or of one thousand trees?

Answers to these questions should be made from reliable experience, and with reference to the proximity or remoteness of the market.

Held, as this convention will be, in a city easily accessible from all parts of the country, it is anticipated that the coming session will be one of the most useful the Society has ever held. Societies, therefore, in every State and Territory of the Union, and the Provinces, of British America, are requested to send such number of delegates as they may choose to elect. Fruitgrowers, Nurserymen, and all others interested in the art of Pomology, are invited to be present - to become members, and to take part in the deliberations of the Convention.

In order to increase as much as possible the interest of the occasion, members and delegates are requested to forward for Exhibition as large collections of fruit as practicable, including specimens of all the rare and valuable varieties grown in their respective districts, and esteemed worthy of notice; also, papers descriptive of their mode of cultivation, of diseases and insects injurious to vegetation, of remedies for the same, and to communicate whatever may aid in promoting the objects of the meeting. Each contributor is requested to make out a complete list of his contributions, and present the same with his fruits, that a report of all the varieties entered may be submitted to the meeting as soon as practicable after its organization.

Societies will please transmit to the Secretary, at an early day, a list of the delegates they have appointed.

Gentlemen desirous of becoming members can remit the admission fee to Thomas P. James, Esq., Treasurer, Philadelphia, who will furnish them with the transactions of the Society. Life Membership, twenty dollars; Biennial, two dollars.

Packages of fruit may be addressed to Thus. P. James.", 630 Market street, Philadelphia.

Thomas W. Field, Secretary, Marshall P. Wilder, President, Brooklyn, New York. Boston, Mass.