The Secretary read translated extracts from a paper in the Revue Horticole of Paris, Sept., 1855, by M, Klotzsck, of the Royal Academy of Sciences, Vienna, on the utility of hybrids. M. Klotzsch has crossed the Finns Nigricans with the Sylvestris the Quercus robur with the Quercus pedunculate. Their seeds produce trees, which, in eight years, are one-third larger than trees from the seed of the parents separately. They were all planted on the same day, and under similar circumstances.

The Secretary read a letter from Dr. Underfill], of Croton Point Vineyards, in which he suggests, that by planting plum-trees so as to overhang water, they are very certain to he free from the curculio and other insects, which are deterred by instinct from depositing eggs where they will bo likely to fall into the water. The doctor commenced his experiments eight years ago, and now has about 200 plum-trees, the larger portion of which have come into bearing, and over 60 have produced fine crops of fruit - and during this time they hare been entirely exempt from the ravages of all insects. The doctor constructed a small artificial lake, upon the margin of which the trees were planted.

Mr. Atwill, of Iowa, gave an interesting account of the climate, products, and social condition of that States.