148 CYCLONES. 
the Cyclone, and here, stretching quite across it, and at right 
angles to its line of movement, is the ‘ Trough line of squalls 
and clearing showers.” After passing this line, the Barometer, 
which up to now must have been falling, will again commence to 
rise, and it is here that the most dangerous squalls of wind are 
usually met with, the direction of the wind also changes more 
rapidly at this point as a general rule. Further back in the 
Cyclone we come to ‘‘ showers or squalls,” with a north or north- 
west wind, and ‘‘cool,” marking the cold, dry, bracing air, gene- 
rally felt at the rear of Cyclones. This cool north-west wind, 
and rising barometer at the back of Cyclones, explains the mean- 
ing of the proverb, ‘ Do business with men when the wind is in 
the north-west ”—the falling barometer, neuralgia, rheumatism, 
and corns, that accompany the front of a Cyclone, are evidently 
not calculated to improve men’s tempers. 
The weather that may be expected during the passage of a 
Cyclone, it must be borne in mind, varies very much in infensity, 
and this intensity is strictly dependent on the closeness or the 
reverse, of the lines of equal barometric pressure. I have shown 
before how the strength of the wind depends on the closeness of 
these lines. In fact there is no difference between Cyclones 
which cause storms, and those which cause ordinary unsettled 
weather, but zéensity, and this, I repeat, is caused by the relative 
closeness of the lines of equal barometric pressure. I may 
observe here that the word “ Depression” is more often used now 
in our weather reports, than ‘‘Cyclone”; they both, however, 
mean exactly the same thing. A ‘‘deep depression” means a 
Cyclone with the pressure very low in the middle in comparison 
to the outside, consequently the lines of barometric pressure are 
usually close together, so bringing high winds and storms. 
I should now like to call your attention to what happens to the 
direction of the wind at any one spot, say here in Burton, as a 
Cyclone goes by us. Let us first take the most common case, in 
which a Cyclone from the Atlantic Ocean, and moving from 
south-west to north-east, passes with its centre to the north of us. 
Look at Fig. 1, and imagine instead of the Cyclone moving in a 
