Dear Sir: I send you a parcel of seed of a beautiful evergreen, known among us as the wild or mock Orange. I infer that it is a stranger to you, from having never seen it noticed in your journal. Perhaps, however, you may know it by some other name - if so, you will identify it by the sprig of leaves, and by the fruit, a small glossy black drupe, which I enclose.

At the south we have many noble evergreens, but not one which will surpass it either for elegance or form, or for denseness or beauty of foliage. It is a universal favorite, and, though from the abundance of prussic acid which is found in all parts of the tree, it is supposed to be poisonous, it is found in every garden, I have never heard of a serious accident from it.

It has this peculiarity that it bears the shears well. I have seen it trained from the ground in the proportions of the pyramidal cypress: and again kept as a border-edging, though when left to itself, it will attain a height of forty or fifty feet, with a trunk of from nine to eighteen inches in thickness. As a screen, too, it is at once handsome and impervious to the sight. I believe it would withstand your vigorous winter elimate well, for here it thaws through a thick coating of ice, with as little apparent damage, as any deciduous tree of them all.

You will observo that they are enclosed in an oil-silk bag, which will suggest to you the propriety of planting them immediately. First, however, soak thorn for about twenty four hours in water, as this is always done by those who succeed with it best. I have stripped off the pi neaps, a precaution which makes them generally a sure crop.

Hoping that you will excuse the liberty I have taken, and that the seed may reach you safely, I am, very truly, etc. 0. South Carolina, Dec. 6, 1851.

Our correspondent will receive our thanks for the acceptable present. The evergreen is the Cerasus Caroliniensis - nearly related to those beautiful evergreens, the English laurel and the Portugal laurel - which are the ornament of almost every European garden. It should be called the Carolina laurel - as it has no affinity with the orange. We regret to say that it will not stand the winters here, as we have proved by trial. We think it will be hardy at Baltimore, and we have sent the seeds to Washington to be planted there, where this tree will be very ornamental. En.