In many cases Persian walnut trees remain barren when planted alone, not because of incompatibility between the pollen and the pistillate flower, but because pollen shedding and receptivity do not occur at the same time. Sometimes pollen shedding is over before pistils are receptive. Such blooming is termed protandrous by botanists. In about an equal number of cases the pistils lose their receptivity before pollen is shed. Such blooming is termed protogynous. There are quite a number of varieties, however, that mature both types of blossoms simultaneously, in which the variety is self-fertile and will produce crops, even if isolated from other trees of the species. Of these Hanson and Bedford are representative. On some other trees there is some overlapping of the shedding and receptive periods, enough to produce partial, but not full crops. Warm weather hastens blooming; cool cloudy weather retards it. A warm spell may start blossoming early, but if broken by a cool wave the period of bloom may be greatly extended. A southern exposure with a light soil will cause a variety to blossom earlier by some days than in the same locality in heavy soil. The blossoming period is generally shorter in the North than in the South. Climax, Michigan reports blooming beginning May 10 and ending May 31, a period of 21 days. Millerton, N. Y., and Massillon, Ohio, report the same. Urbana, Ill., reports blooming beginning May 5 and ending June 1, a period of 27 days. At Roanoke, Va., the period begins April 9 and ends May 10, running 31 days. At Greensboro, North Carolina, the season began April 2 and ended May 5, a total of 33 days. The report of Mr. Royal Oakes of Bluffs, Ill., is unique in the shortness of the blossoming period, both of individual varieties and as a whole. Blossoming began April 29 and ended (estimated) May 13, a period of only 14 days. The reason may partly lie in the weather and partly because the planting is on high bluffs overlooking the broad Illinois River valley, affording excellent air drainage. One major difficulty the Committee encountered in tabulating the reports was the fact that so few of the same varieties were being grown by the various reporters, making it difficult and sometimes impossible to synchronize the blossoming period of the various varieties from different places with sufficient accuracy. Because of this, two tables have been prepared. Table Number 1 shows named varieties, for the most part. Table Number 2 shows varieties that are being propagated asexually, but have not yet been given variety names. Seedlings not propagated by budding or grafting, if recognized have been omitted because of individual variability. Each table consists of five vertical columns, earliest to the right, successively later towards the left.