In this figure the arrow-head is supposed to be directed true north, and the hurricane--as is the case in the American storms north of the 30th parallel--to be moving towards the N.E. on the line N.E.--S.W. If the ship take the hurricane with the wind S.E.,--the letters within the two larger circles indicating _the direction of the wind in the storm_ according to the rotation as shown by the circle of arrow-heads, and which it is to be particularly noted is in the northern hemisphere _contrary to the direction in which the hands of a watch move_: in the southern hemisphere the rotation is reversed--the only phaenomena presented by the storm are as follows:--The wind continues to blow from the S.E., increasing considerably in force with the barometer falling to a very great extent until the centre of the storm reaches the ship, when the fury of the winds is hushed, and a lull or calm takes place, generally for about half an hour, after which the wind springs up mostly with increased violence, but from the opposite quarter N.W., the barometer begins to rise, and as the storm passes off, the force of the wind abates. The point to which we wish particularly to direct attention in connexion with this exposition of the phaenomena attending the transmission of a storm is this:--If the observer so place himself at the commencement that the wind passes _from his left hand towards his right_, his face will be directed towards the centre of the storm; and the wind undergoing no change in direction, but only in force, will acquaint him with this important fact that the _centre_ is not only gradually but surely approaching him: in other words, in the case before us, when he finds the wind from the S.E., and he places himself with his face to the S.W. he is looking towards the centre, and the wind rushes past him _from his left to his right hand_. Now the connexion of the barometer with this phase of the storm is _falling with the wind from left to right, the observer facing the centre while the first half is transiting_.[1] During the latter half these conditions are reversed, the observer still keeping his position, his face directed to the S.W., the barometer _rises_ with a N.W. wind, which rushes past him _from his right to his left hand_ with a decreasing force. We have therefore _a rising barometer with the wind from right to left during the latter half of the storm, the observer having his back to the centre_.