1918-19.] The Origin of Anticyclones and Depressions. 
69 
the conditions at corresponding levels in the undisturbed area are as 
follows : — The pressure over A is increased at all levels. The temperature 
is also increased at all levels, the amount of this increase being a maximum 
i 
l 
j 
1 
\ 
p 
R E 
8 S U R 
e Inc 
REAS 
E D. 
Density 
Increased. 
Density Reduced or 
slightly Increased. 
Density 
Increased. 
Entropy 
slightly 
Increased. 
Entropy Increased. 
Entropy 
Reduced. 
\ 
H = 
= x 
f 
H = 
\ 
= y 
i 
i 
i 
1 
1 
> _ \ 
' 
p 
R E 
S S U R 
e Dec 
REAS 
E D. 
Density 
Decreased. 
Density Increased or 
slightly Decreased. 
Density 
Decreased, 
Entropy 
slightly 
Decreased. 
Entropy Decreased. 
Entropy 
Increased. 
| 
i 
V 
1 
i 
U 
Fig. 5. — Well-established Anticyclone and Cyclone of fig. 1 type. 
The arrows show, not the winds, but small components of the winds. Compare fig. 8. 
Double-line arrows for dense air. 
in the region of heat absorption. The density is increased at all levels, 
the increase being least (perhaps occasionally negative) in the region of 
origin. The entropy is increased considerably in the region of origin, 
and slightly in lower regions (owing to downward movement); but at 
higher altitudes is reduced by reason of the uplift. In the cyclonic region 
