In all these investigations we have found the stock problem is very important. Here we have the _Pistachia atlantica_ which has much smaller seeds. It is this that we are using most commonly as a stock for the pistaches that are being grown in California. Frank N. Meyer brought back from China the seeds of the Chinese pistache, the hardiest of all pistaches, a tree which has been almost hardy even as far north as Washington and central Kansas. It is not only a nut tree but a magnificent ornamental tree and grows to a very large size. We have used it as an avenue tree leading to our plant introduction gardens in Chico because it colors up so beautifully in the autumn and the spring. In the spring the tips of these leaves and branches are a brilliant pink and in the autumn it turns a gorgeous scarlet. It is destined to be one of the best landscape trees of California in our opinion. It grows to be centuries old. Frank Meyer standing beside a tree which has stood three centuries at least. Imagine what pleasure he would have had had he only lived to walk under this great avenue in his old age. The question of congeniality between the true pistache and the Chinese pistache is shown here. We rather jumped to the conclusion, when we found that the ordinary pistache overgrew the Chinese pistache, that perhaps it was not so good a stock as we first thought, but I notice, looking back at my photograph taken in Greece in 1901, that the regular stocks used by the Greeks for the pistache are overgrown in the same way by the true pistache. We have much larger trees than these now in Chico and as the Chinese pistaches are very old and large trees we have come to the conclusion that in all probability the pistache will be successful on this Chinese stock. I was walking through a market in Hong Kong in 1902 and I saw a few bushels of nuts that I had never heard of or seen before. The nuts looked like acorns but when I picked them up I found them as hard as hickory nuts. I cracked one of them with a brick and it was almost as hard to crack as a hickory nut. It was unmistakably an acorn, I thought, and I bought a bushel of the nuts and sent them to this country. It is called Pisania by botanists and it has many of the characteristics of an acorn. The kernel of this nut comes out whole and for that reason it would be very easily cracked by mechanical means. It has a sweetness which does not suggest an acorn. It does not remind you of the acorn. It is a commercial product in Southern China shipped down the West river and it seemed to me well worth while trying to grow it in the United States. We have had a great deal of trouble with it. We did not find the right place for it at first. It was hardy here in Washington, even, for a few seasons but the temperature at seventeen, eighteen and twenty below zero finally killed it out. It is now growing down in Mississippi.