In the fall of 1952, we collected seeds of Akamatsu and Kuromtsu from various districts of Japan. These were sown in April 1953, and were transplanted in April 1954, at the nursery of the Shimane Agricultural College near Matsue City.
Relations between site of the seed trees, seed size and growth of 1-0 and 2-1 seedlings were examined on these materials. The following results were obtained.
1. The difference of seed size in each site samples have an effect heavily on the growth of 1-0 seedling for the first year, but no etfect were seen on the growth of 2-1 seedling for the second year.
2. The seed size of each site samples have no effect of the growth of seedlings.
3. The seed of Kuromatsu is heavier than of Akamatsu, but the height growth of 1-0 seedling of Akamatsu is larger than of Kuromatsu, and the difference of height growth of 2-1 seedling be tween both species are not seen.
4. It seems that the climatic character of the site of the seed trees have no effect on these materials.