"September 7 and 8: Wild hazels ripe and picked at this time. (Their kernels showed no shrinkage by October 25.)

September 14 and 15: I picked ripe nuts from hazilbert No. 5 which seems to be the first to ripen. Also picked half of the European filberts. (There was slight shrinkage in the kernels of the latter a few weeks later showing that they could have stayed on the trees another week to advantage.)

All of the nuts of a Jones hybrid, which is a cross between Rush and some European variety such as Italian Red, could have been picked as they were ripe. Some were picked.

The almond-shaped filbert classified as the White Aveline type, was not quite ripe; neither were hazilberts No. 2 and No. 4, nor the Gellatly filberts. Wild hazelnuts at this time had dry husks and were falling off the bushes or being cut down by mice.

September 21 and 22: The remaining European filberts of the imported plants were picked. Also, I picked half of the White Aveline type nuts.

On October 20, I had an opportunity of comparing the action of frost on the leaves of these plants. Those of the White Aveline type had not changed color and were very green. The leaves of the Jones hybrid showed some coloration but nothing to compare with those of the Winkler hazel, many of which had the most beautiful colors of any of the trees on the farm—red, orange and yellow bronze. Hazilbert No. 1, which resembles a wild hazel in appearance and habits of growth, had colored much earlier in reaction to the frost and was as brightly tinted as the wild hazel and Winkler plants except that, like the wild hazel, it had already lost much of its foliage. Some of the wild hazels were entirely devoid of leaves at this time. Hazilbert No. 5 showed the best color effects with No. 4 second and No. 2 last.

The color of the leaves and the action of the frost on the plants during the autumn is another thing, in my opinion, that helps to differentiate between and to classify European filberts, American hazels and their hybrids. My conclusion in regard to the effect of frost is that the reaction of the Winkler hazel is very similar to that of the wild hazel in color but exceeding it in beauty since its leaves do not drop as soon after coloring. At this time, the leaves had not changed color on the imported European plants, the Gellatly filberts from British Columbia or the White Aveline type. They had turned only slightly on the Jones hybrid. I think an accurate idea of the general hardiness of a plant is indicated by the effect of frost and by early dropping of leaves, using the sturdy wild hazel as the limit of hardiness and assuming that its hardiness is shown by both degree of coloration and early dropping of leaves.

In noting the action of frost on the Winkler hazel, I have mentioned that it was more like that on the American hazel than on the European filberts. The Winkler has always been considered a native woodland hazel, but, although it does show several similarities to Corylus Americana, I have also noticed certain qualities which definitely suggest some filbert heritage. I have based my theory on a study of the Winkler hazels which have been bearing annually at my farm for six years, bearing more regularly, in fact, than even the wild hazels growing nearby. My comparisons have been made with wild hazels in both Minnesota and Wisconsin and with European filberts.

I found the first point of similarity with the filbert is in the involucre covering the nut. In the wild hazel, this folds against itself to one side of the nut, while in the filbert it is about balanced and if not already exposing a large part of the end of the nut, is easily opened. The involucre of the Winkler hazel is formed much more like that of the filbert than that of the hazel. In Corylus Americana this involucre is usually thick, tough and watery, while in the filbert it is thinner and drier, so that while a person may be deceived in the size of a hazelnut still in its husk, he can easily tell that of a filbert. This is also true of the Winkler whose involucre is fairly thick but outlines the form of the enclosed nut. Another feature about the involucre of the Winkler which classes it with the filberts rather than the hazels is in its appearance and texture, which is smooth and velvety while that of the hazel is hairy and wrinkled.

The staminate blooms of the Winkler hazel show similarity to those of both filberts and hazels. Sometimes they appear in formation at the ends of branches, much as those of the European filberts do, in overlapping groups of three or four. Again, they may be found at regular intervals at the axis of leaf stems very much as in the case of the American hazel. The buds on the Winkler hazel are dull red which is also true of those on the hybrid hazilberts, another indication of hybridity.

The initial growth of the embryo nut is very slow in the Winkler as it is in the filbert, as contrasted with the very rapid development of the native hazel embryo which matures in this latitude about one month ahead of the Winklers and some filberts. Although Winkler nuts are shaped like hazels and have the typically thick shells of hazelnuts, their size is more that of a filbert usually three times as large as a native hazel.

During the years between 1942 and 1945 many new hybrids between filberts and hazels were produced. Four wild varieties of hazels, which had unusual characteristics such as tremendous bearing and large size nuts and others having very early maturing or very thin shelled nuts were used as the female parents in making the crosses. Pollen was obtained from other parts of the U. S. or from filbert bushes which were growing on the place. Crosses included pollen of the Barcelona, Duchilly, Red Aveline, White Aveline, Purple Aveline, the Italian Red, Daviana and several hybrids between other filberts and hazels. By 1945 the number of these plants were in the neighborhood of 2000 and by 1952 considerable knowledge had been gained as to the hardiness, blight resistance to the common hazel blight (known scientifically as cryptosporella anomala), freedom from the curculio of the hazelnuts (commonly known as the hazel weevil) and resistance to other insect pests. Also, considerable data had been accumulated by cataloging over 650 trees each year for five years; cataloging included varied and detailed studies of their growth, bearing habits, ability to resist blight, curculio and other insects, the size of the nut, the thinness of the shell and the flavor of the kernel. Several books of all this detail were accumulated in trying to nail down several commercial varieties that would be propagated from this vast amount of material. Although some bushes produced good nuts at the rate of as much as two tons to the acre, measured on the basis of space that they took up in the test orchard, the most prolific kind seemed to be the ones that had a tendency to revert to the wild hazel type. The better and thinner-shelled types, more resembling the filberts, seemed to be shy bearers so that there being a host of new plants to catalog (more than 1000) which had not indicated their bearing characteristics, we included these among the possible ideal plants we were seeking. Although there were several plants that could be considered commercial in the original group of over 650 it has been thought that the waiting of a few more years to ascertain whether there would be something better in the next 1000 plants to bear that would be worthwhile waiting for and no attempt has been made to propagate the earlier tested plants. Some of these 650 tested hybrids proved to have nuts that were classed as Giants being much larger than the filberts produced by male or pollen parent such as the Barcelona, Duchilly or Daviana, and several times the size of the nuts of the female parent which was the wild hazel.