Tbe author of the present paper observed the distribution of the depth of snow lying around the obstacle at Toyohara, Sakhalin. It is evident that the uneven depth of snow lying is caused by the disturbance of air current due to the obstacle itself. The results of observation are as follows:- (1) The unevenness of snow lying has some general features. There is a zone of no snow in the windward side and the flank of the obstacle, and a zone of slight snow lying in the lee which extends to a considerable distance. The snow lies comparatively deep outside these zones. (2) The disturbance of air current near the earth surface caused by the obstacle may have following features. In a space, which has a shape of a kind of fish containing the obstacle in its head, there is a stationary vortex motion or a turbulent motion, and outside the space the motion is nearly stream line flow. (3) The relation between the breadth of the obstacle and the diameter of the “Luvwirbel” was shown by the diagram. (4) The “Luvwirbel” cannot be disappeared by changing the shape of the obstacle which stands perpendicularly to the ground because the natural wind is ever changing its direction in some extent.
The hourly observations of dissolved O2, pH in water and meteorological elements were made from 16th to 17th Sept. at Lake Sanaru near Hamamatu. From these observations we obtained the following results: 1. The quantity of the dissolved O2 in the surface-and 1m-layers of the lake was supersaturated, the maximum value of O2 in the surface layer appeared at 15h. on 16th, showing 8.08 cc/L (145.7%) and the minimum at 7 h. on 17th. and the amplitude of diurnal change of O2 was 2.35 cc/L. 2. It is a remarkable characteristic that pH showed the value of above 9 (Thymol blue as indicator) all day long, and the value of pH was high at night. The feature of the diurnal change of phenolphthalein alkalinity nearly resembles that of pH. 3. As far as the present observation was concerned, we could not find out the remarkable relatiónship between the dissolved O2 and the some meteorological elements, it is still recognizable that an exponential relation exists between the value of dissolved oxygen and the mean velocity of wind.