10 E. Loomis—Results from an examination of the 
The average ratio of the two axes of the isobars about an 
area of minimum pressure was found to be 1°94; and in nearly 
four per cent of the cases the major axis was four times the 
minor axis 
and column second shows the number of cases occurring in 
each interval. In order to eliminate the influence of accidental 
isobars about an area of minimum pressure as heretofore re- 
ported, and column 5th shows the averages of the same numbers 
taken in sets of three. These numbers also show a decided 
nomenon is of a local nature, I have made a similar comparison 
of European observations. I took Hoffmeyer’s charts from 
Dec., 1878, to Nov., 1874 and measured the form of the isobars 
about each storm center. 
Position of the Major Axis of the Isobars. 
UNITED STATES. EUROPE. 
DIRECTIONS. | High Barom. Low Barom. Low Barom, High Barom. 
Cases. | Aver. | Cases.) Aver. || Cases.| Aver. | Cases. | Aver. 
0° 10° 19 16 li 12 7 5 2 “3 
10 20 12 15 18 it 8 6 3 2 
20 — 30 14 a | 15 22 4 6 2 2 
30 — 40 25 20 34 24 6 6 1 1 
- 21 25 23 26 7 % + 1 
50 — 60 29 22 22 Vi 7 6 2 3 
60 — 70 17 17 7 15 4 5 és 5 
76 — 80 8 12 16 10 4 3 5 6 
80 — 90 1l y 8 13 1 2 5 4 
90 -100 3 5 14 1 ] 2 4 
100 -110 2 3 9 10 ae 2 5 2 
110 —120 5 4 7 6 3 2 3 4 
120 -130 6 5 3 6 3 4 5 a 
130 —140 5 i 7 6 5 4 r F | 
140 -150 9 5 8 8 3 3 2 1 
150 -160 6 8 8 8 2 2 1 1 
160 -170 9 10 8 9 1 2 1 2 
170 -180 14 15 | 10 | 12 3 4 3 - 
