The variation in the quality of persimmons is greater than that of most wild fruits. Nature usually sets a standard and sticks closely to it, but the rule is not adhered to in the case of persimmons. Some are twice as large as others; some are never fit to eat, no matter how severely or how often they are frosted; others require at least one fierce frost to soften their austerity; but some may be eaten with relish without the ameliorating influence of frost. The austerity of a green persimmon is due to tannin. It is supposed that cultivation might remove some of this objectionable quality, but no great success has thus far attended efforts in that direction. Japanese persimmons, which are of a different species, are cultivated with success in California. The sizes of persimmon trees vary according to soil, climate, and situation. They average rather small, but occasionally reach a height of 100 feet and a diameter of nearly two. Mature trunks are usually little over twelve inches in diameter, and many never reach that size. The dry wood weighs 49.28 pounds per cubic foot, which is about the weight of hickory. It is hard, strong, compact, and is susceptible of a high polish. The yearly rings are marked by one or more bands of open ducts, and scattered ducts occur in the rest of the wood. The medullary rays are thin and inconspicuous; color of heartwood dark brown, often nearly black; the sapwood is light brown, and frequently contains darker spots. The value of persimmon depends largely upon the proportion of sapwood to heartwood. That was the case formerly more than it is now; for until recent years the heartwood of persimmon was generally thrown away, and the sapwood only was wanted; but demand for the heart has recently increased. There is much difference in the proportion of heartwood to sapwood in different trees. It does not seem to be a matter of size, nor wholly of age. Small trunks sometimes have more heart than large ones. A tree a hundred years old may have heartwood scarcely larger than a lead pencil, and occasionally there is none. In other instances the heart is comparatively large. Persimmon has never been a wood of many uses, as hickory and oak have been. In early times it was considered valuable almost wholly on account of its fruit, and that had no commercial value, as it was seldom offered for sale in the market. In the language of the southern negroes who fully appreciated the fruit, it was “something good to run at”--meaning that the ripe persimmons were gathered and eaten from the trees while they lasted, but that few were preserved.