Abstract
PROF. F. H. BIGELOW contributes to the U.S. A Monthly Weather Review for February a paper on the mechanism of counter-currents of different temperatures in cyclones and anticyclones. An outline theory of the structure of cyclones and anticyclones was described in the report of the Chief of the Weather Bureau for 1898–1899 (vol. ii). It was evident, however, that a more complete insight into the mechanism of motions in a fluid such as air under atmospheric conditions would be afforded by the construction of systems of isobars on at least three planes having different altitudes. For this purpose, the ealevel and the levels of 3500 and 10,000 feet were selected, and since December, 1902, daily reduced pressures for these planes have been received from the regular observing stations of the United States and Canada, and charts have been constructed for them. The approximate gradients needed for a preliminary consideration of the subject have thus been obtained, and the general results of the investigation are stated by Prof. Bigelow as follows:—
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