We have received a letter of interest from J E Holmes, of Newark, Ohio, who informs us that there is a white oak tree, of fine healthy growth, standing near Robinson's Coal Oil Works, in Perry county, on which, at fiftyfive feet from the ground, is engrafted a black oak top of lofty and vigorous growth It is about two feet in diameter at the usual bight of cutting trees, and the body stock is fourteen inches at the grafting portion, and the black oak immediately above it at once enlarges to twentytwo inches The grafting is represented as being of the most perfect description, and there is no appearance of deterioration in either the white or black oak portions There are several limbs below the union, and those above are said to be equal to any tree of the same description in that section of the country, and would form a luxuriant and proper superstructure for a stock of three feet in diameter The only reasonable supposition for this curious growth is, that the white oak portion was broken by the falling of a black oak tree near it, and that a branch of the latter must have been so driven into the fracture as to unite and grow in a firm manner to produce the singular phenomenon above related f i