AUGUST & SEPTEMBER.

All, R.N; Superintendent of Admiralty Charts.

E. Trade, coloured Blue. S.E.Trade, coloured Red. S.W. Monsoon, coloured Purple.

Malby & Sons, Lith.

Cyclones in April and May. October and December. Typhoons from July to Nov.

East Coast of Africa and the Mozambique Channel.

December to March.

Northerly Winds.

April to November.
Southerly Winds.

Between the Equator and the Parallel of 10° S. NOVEMBER TO MARCH-N. W., or Middle Monsoon. A light wind, with squalls, rains, and frequent calms.

APRIL TO SEPTEMBER. - S. E. TRADE.

Between the Parallels of 10° and 25° or 30° S.* Constant S.E. Trade.-Cyclones from December to April.

According to the season of the year.

HURRICANES, CYCLONES, TYPHOONS.

These storms are progressive revolving gales of unusual violence, and may be generally described as great whirlwinds turning round and rolling forward at the same time. The average rate of the progressive movement of the centre or focus of the West Indian hurricanes is about 300 miles a day; of those on the Malabar Coast, Bay of Bengal, and China sea, 200 miles a day, and often less; whilst the Cyclones of the South Indian Ocean vary in their rate of progress from 200 to 50 miles in the twenty-four hours.

Within the tropics the effects of these storms are often felt 100 miles on either side of the central track, this limit expanding in the extra-tropical regions.

The Seasons in which these Storms prevail are as follows:

Hurricanes.-West Indies and American Coast. Coasts of Mexico and Lower California in North Pacific Ocean-July to October, and occasionally November. In South Pacific Ocean, between Australian Coast and Low Archipelago-December to March.

Cyclones.-Malabar Coast and Bay of Bengal-April, May, October, November. South-Indian Ocean--December to April.

Typhoons.-China Sea-July to November. Coasts of Japan— August, September, October.

The peculiar characteristic of the revolving action of these storms is, that in each hemisphere of the world the gyration invariably takes place in one direction, and that direction contrary to the apparent course of the sun; so that in north latitudes these storms revolve from right to left, and in south latitudes from left to right. The knowledge of this law is the more especially important, as it not only supplies the seaman with direct means of distinguishing them from common gales, but it reveals to him the actual position of the centre or vortex with respect to the place of his vessel, and therefore points out with certainty the way to escape from them.