This type was found on every tree except the hardy varieties of Polish and Russian origin. In some cases the large branches were killed outright, but usually the injury was confined to small branches, and the degree of injury varied from slight to very severe killing. Branches so injured were attacked by fungus diseases and some were beginning to decay and fall off when examined in October. Killing back of the branches was also noted on one excellent heartnut at Scotland, Ontario. This tree was subjected to -30 degrees F. but was less severely injured than many of the English walnuts noted above, and when examined in September showed a vigorous new growth throughout most of the top. There were also several vigorous seedlings from this tree growing near by which were only slightly injured in the bark or which were uninjured. It was interesting to observe that the seedlings of the old heartnut tree that were apparently of hybrid origin were not injured in the least and bore good crops of nuts this year, but the seedlings that were pure heartnuts were injured slightly. This point suggests the desirability of crossing the finest heartnuts with the best butternuts to get a combination of the hardiness of the butternut with the good qualities of the heartnut. _Bark Killing_ Bark injury is often found on fruit trees following a severe winter and is occasionally found on nut trees. It may be due to bark splitting or to desiccation or both. In severe cases of bark splitting the bark splits vertically and laterally from the ground up for several feet, but in milder cases the bark is only split away for a short distance. Where the bark is loosened for some distance around the tree or vertically it dies shortly thereafter, but where only a small amount of splitting occurs, the tree may recover if given attention. In such cases the bark should be cut back to the living tissue and all particles of dead or injured bark scraped off. The exposed area should then be coated with a good tree paint or asphaltic emulsion. The severest case of bark splitting observed was on a vigorous young heartnut seedling at Guelph, Ontario. On this tree the bark was completely split away entirely around the trunk from the ground up for several feet and the injury was so great that the tree died early in the summer. Within a short distance of this tree was another tree of the same origin that was quite uninjured, but this tree, however, was a hybrid between the butternut and the heartnut. On this hardy tree there was a heavy crop of nuts that were intermediate in form between the heartnut and the butternut, this indicating its hybrid origin. Practically all of these hybrids escaped injury even though the temperature was -30 degrees F.