Among the Romans, besides a number of historians, at least three writers before Christ discussed in detail agriculture and, in connection with it, tree culture; namely, _Cato_ (234-149 B.C.) who wrote an excellent work _De re rustica_, in 162 chapters; _Varro_ (116-26 B.C.), also _De re rustica_, in three books; and _Vergilius Maro_ (70-19 B.C.), who in his _Georgica_ records in six books the state of knowledge at that time. Of the many writers on these subjects who came in the Christian era there are also three to be mentioned, namely, _Cajus Plinius Major_ (23-79 A.D.), who in his _Historia naturalis_, in 37 books, discusses also the technique of silviculture; _Lucius Junius Moderatus Columella_ (about 50 A.D.), with 12 books, _De re rustica_, and one book _De arboribus_, the former being the best work of the ancients on the subject; and _Palladius_, writing about 350 A.D., 13 books, _De re rustica_, which in the original and in translations was read until past the middle ages. Only a few references which exhibit the state of knowledge on arboricultural subjects among the Romans as shown in this literature may be cited, some of which knowledge was also developed in Greece and found application, more or less, throughout the Roman empire from India to Spain. Nursery practice was already well known to Cato, while Varro knew, besides sowing and planting, the art of grafting and layering, and Columella discusses in addition pruning and pollarding (which latter was practiced for securing fuelwood), and the propriety of leaving the pruned trees two years to recuperate before applying the knife again. The method of wintering acorns and chestnuts in sand, working them over every 30 days and separating the poor seed by floating in water, was known to Columella and, indeed, he discusses nursery management with minute detail, even the advantages of transplants and of doubly transplanted material. The question whether to plant or to sow, the preference of fall or spring planting with distinction for different species and localities are matters under his consideration; and preference of sowing oak and chestnut instead of transplanting is pointed out and supported by good reasons. Pliny, the Humboldt of the ancients, recognizes tolerance of different species, the need of different treatment for different species, the desirability of transplanting to soil and climatic conditions similar to those to which the tree was accustomed, and of placing the trees as they stood with reference to the sun. But, to be sure, he also has many curious notions, as for instance his counsel to set shallow rooted trees deeper than they stood before, his advice not to plant during rain, or windy weather and his laying much stress on the phases of the moon as influencing results. * * * * *