THE current number (July) of the Monthly Weather Review (Washington) contains a paper on the observation of halo phenomena. This is a translation of a reprint of an article by the Rev. K. Schips in the Year-book of the Natural History Association, a copy of which we have received. A committee has been formed in Germany for the study of halos, and a request is made for the regular observation of these phenomena, as it appears that the subject of meteorological optics receives no great attention, except in Japan. The paper will be found instructive to both observers and students.—The equations of hydrodynamics in a form suitable for application to problems connected with the movements of the earth's atmosphere, by J. Cottier. This contribution is of much importance to those who are studying the fundamental problem of meteorology. Mr. Cottier, who was a student of brilliant promise, unfortunately died on August 17.—Rain gushes in thunderstorms, by the editor (Prof. Cleveland Abbe). Several plausible explanations of this phenomenon have been put forward from time to time, but have been rejected as erroneous. It is at present an open question whether the gushes of rain bring about the formation of lightning, or vice versâ. Several suggestions are made by the editor, which require to be tested by further experiment.—Among various other notes there is an interesting one, entitled “Kites at the Chicago Conference, August 1893.” This method of obtaining information relating to the upper air is daily becoming more popular, and seems likely to lead to useful results.