抄録
After the studying from topographical maps the recent lava flows that issued from Mt. Sakurazima, Mt. Asama, Mt. Huzi, etc., I have divided them into two classes, the zonal and fanshaped, as in Fig. 4. The forms due to various conditions, such as the physical and chemical properties of lava, the original topography, etc. But the problems dealt are restricted to form and shape, Most lava flows have complex features of folds, hills, and depressions, particularly, eracks, both transversal and diagonal (I have not yet come across longitudinal cracks). These flows are interesting, because of their resemblance in several ways to glaciers. I cannot illustrate any cracks in block lava flow.
