When man or nature, and sometimes both, change the natural habits of a tree, most anything can happen. There are years when the black walnut sets very few fruits either on the seedling trees or trees of named varieties. Some few trees have alternate years of production, while other trees bear annually and some not at all. Good results and good crops may be expected only when several factors are normal and conditions favorable. After twenty years of keeping records and observations on nut trees and through correspondence with other growers, I consider the main reason for crop failure or light production to be climatic conditions and the weather for an entire year. The black walnut produces a pistillate flower at the end of the present season's growth. The staminate flowers, or catkins, come from last year's wood. Good growing conditions are desirable for wood growth and fruit bud formation and any retarding of growth the previous season means little or no production. Winter injury to wood and bud, diseases or insects attacking the foliage, soil moisture, and summer temperatures will lower tree vitality. There are times when strong vigorous trees fail to fruit which could be due to a high or low carbohydrate-nitrogen balance. Soil type, plant food, age of tree, and location will have some influence on annual or even biennial production but yet are not the all important reasons for light crops. The pollen of the black walnut is mostly wind borne as few insects ever visit the flowers and pollination is dependent on wind borne pollen. Trees planted in groups and close together are generally more productive than trees planted in orchard rows even as close as 40' by 40'. When the weather is cold and rainy during bloom, one should not expect much of a crop. The staminate flowers opened early in Indiana the years of 1950, 1951, and 1952. The weather was more or less ideal during the time the catkins had elongated and about ready to shed pollen. This warm spell was followed by a fairly cool weather and considerable rain, which delayed the opening of the pistillate flowers, consequently the pollen dried and was lost before the pistil was receptive. The few walnut trees in the University plantation have always had the best of care. The trees have been mulched, fertilized (both through root and leaf feedings), sprayed, cultivated and seeded to grass with the grass clipped. The trees are some distance away from other seedling walnuts and a bit off the beaten path of the right direction of the spring winds. The varieties are Ohio, Stambaugh, Stabler, Rohwer, and Thomas. When the spring weather is balmy at flowering time, the trees bear a respectable crop but let the weather change to cool and moist and then that is the time one begins to think about calling up the sawmill to see if there is any need for some good walnut logs. MR. MAGILL: That's a mighty good discussion. I see Mr. Ward has been observing walnut trees closer than I assumed he had.