On the Fixation of the Spores of the Laver, Porphyra tenera, in the Bay of Hiroshima. 1

In order to decide the optimal period for setting bamboo twigs in the sea for the culture of the laver, the twigs were set in intervals and the young buds attached on them were counted. Many buds were observed on the bamboo twigs set in the period from the end of September to early November, especially on those set on windy days (Fig. 1). From this fact, it is supposed that the spores of the laver appear chiefly in windy weather.