in an easterly direction. Often they pay visits to the Empire of Japan, and are even felt, across the Pacific; where some of them have been followed, step by step, as far as the western coast of North America, and even on that continent.
As a rule, and in the far greater number of cases, the tracks of all these cyclones are fairly simple. To the principal movement of translation, however, may be added some wanderings or swervings to the right. or to the left, similar to the winding of an eddy produced by the stream of a river. But these accidental motions, very difficult to trace with certainty in so vast a whirl as a typhoon, are relatively very limited and of short duration, and they do not affect the general pace of the trajectory. This time the matter is one of a well constituted storm, with a deep and well defined central vortex, surrounded by violent winds, which for more than ten days moved along an apparently capricious path, recurving twice to the same place, between lat. 25° and 30°, always in close vicinity to the chain of islands joining Formosa to Japan, Thanks to the observations of the meteorological stations established on these islands, together with the reports of the steamers affected by the cyclone, the successive positions of the vortex may be determined with a fair degree of certainty as will be seen hereafter. We insist upon the fact that we don't speak here of the movements of a minimum more or less loose and vague, but of the continuous and well established path of a perfectly defined and violent typhoon.
Prof. Stephen S. Visher has published in 1923 a very interesting note, a reprint of his article of November 1922 in the Monthly Weather Review of Washington: the title being « Notes on typhoons with charts of normal and aberrant tracks » The chart of abnormal tracks as well as the tables on pages 585 and 586 are very instructive. Almost all the cases collected there tock place to the south of the 25th. parallel; the one now under consideration was traced beyond that latitude, and its complexity and duration are greater than the instances collected in the chart of Mr. S. S. Visher. Here we give at first the description of the trajectory such as we have made it out.
II. — TRACK OF THE TYPHOON OF AUGUST
5TH To 23RD 1924.
(See the annexed map.)
The actual typhoon had been preceded by another cyclone, haying probably the same origin; it almost frequently happens, chiefly in the middle of the season, that typhoons thus travel in pairs or follow each other at very short intervals. The first centre having passed near the Bonin Is., on the 4th,, travelled in two days to Kagoshima (Kiusiu) then crossing the Yellow Sea, in a NW direction, landed
