1. A swell, produced by the storm-wave, rolling in upon the shore, at first of a gentle character. The direction of this swell will pretty surely indicate the bearing of the storm, and its changes will point out in some localities the course the hurricane may be pursuing. 2. A swell rolling in, without changing its direction, may be regarded as indicative of a hurricane approaching the shore. The same phenomenon met with at sea (the ship’s course being taken into account) will indicate the bearing down of the cyclone on the vessel. 3. A dirty green appearance of the ocean; on some occasions its assuming a muddy or brown color, on others its being remarkably clear, its temperature increasing, and its swellings stronger than at other times,—are all indications of the proximity of a cyclone. The area over which these rotary storms have been known to expand, varies from 30 to 40 to 1,000 miles; but while the diameter, so long as the storm is within the tropics, expands but very gradually, it suddenly increases in a remarkable manner after recurving. The rate at which they travel on their onward course also varies greatly, not only in different parts of the globe, but even in the same locality, and at the same season. Generally, however, the rapidity with which the vortex of the hurricane progresses is greater as the storm recurves on reaching the outer edge of the trade winds. Thus, the hurricane of August, 1853, traversed 6,276 English miles in about twelve days, with a mean progressive velocity of twenty-six miles per hour; but after it arrived at the Banks of Newfoundland this velocity was increased to about fifty miles per hour. Within the area of the cyclone the moving body of air frequently attains a rotatory velocity of from seventy to one hundred miles an hour. TABLE SHOWING THE DIFFERENT MONTHS OF THE YEAR IN WHICH HURRICANES AND CYCLONES HAVE BEEN RECORDED IN VARIOUS REGIONS.