18 E. Loomis—Results derived from an examination of the 
four miles per hour, and also November 18th, 1873, when the 
wind at Indianola was fifty miles per hour. In these and many 
similar cases, there was an area of high barometer in Dakota, 
causing northerly winds at all places on the south side of this 
center from Dakota to the Gulf of Mexico. The frequency of 
violent winds in this region is ascribed to two causes, viz., the 
country is generally destitute of forests and the air is uncom- 
monly dry. 
The frequency of violent winds at Indianola is specially re- 
markable. In order to discover the cause of this phenomenon 
I have prepared the following table, in which column 1st shows 
the dates at which the winds attained a velocity of forty miles 
r hour; column 2d shows the velocity observed; column 3d 
shows the direction of the wind ; column 4th shows the height 
of the barometer; column 5th shows the rain-fall in inches 
during the preceding eight hours; column 6th shows the tem- 
perature of the air at Indianola; column 7th shows the aver- 
Violent winds at Indianola. 
Wind. Thermometer. High on North. 
Barom.' Rain — 
Vel. | Direc. tmp. mp. Differ.; Barom. | Direction.| Dist. 
1872, Oct. 7. ] 29°99 {0°13 | 70°) 82°;—12°) 30-23 .45°W.| 1200 
Nov. 6.2} 40 29°7 6| 57 8 "15 |N. 43 E. 7 
cA ae ase 2 29°83 02; 63 | 18 |—26 "31 [N.45 W.! 1200 
14.1} 46 |; N. 30°06 0} 41 i8 |—37 “87 .31 W.| 1500 
14, 8 s 30°14 0| 49 ig 29 *88 .31 W.| 1500 
Dec. 10.1) 40 - 29°86 |2°14] 47 14 | —27 “65 (32 690 
1873, Jan. 28.1} 43 Fe 30°20 | -05| 30 14 |—44 "BS ay ease 750 
28. . 30°33 0} 23 (44 +5 4 IN. 7 E. 750 
30°42 0} 20 | 74 |—54 42 IN et Ee, 750 
30°17 0} 6 74 |—20 “AE .10 W.} 1100 
30-2: 0; 560 | 75 |—25 | ‘93 IN.10 W.| 1100 
29°91 0; 6 » |—18 “76 .10 W.| 1100 
30°32 0; 48 | 75 |—2T 44 | North | 1200 
N. 29°93 0; 48 | 8L |—33 4% .10 W.} 1100 
N. 30°19 0| 56 —25 5] .31 W.| 1500 
N. |} 29°96 0| 58 3 '—20 “42 .10 W.| 1100 
N.E.} 30°16 0| 57 t |—17 26 IN. 31 E. 300 
N. | 30°22 0| 57 L j—17 ‘46 N.45 W.| 1200 
N. |} 30°12 | -15| 49 | 74 |—25 50 IN. 4 Wi) 970 
N, | 30°25 0} 44 L | —30 “4 10 E. 500 
| N. | 30°17} 0} 43 | 81 |—38 3 10 E.| 600 
a - | 29°70 | -08| 55 | 81 |—26 46 | North | 1 
LN. | 30°05 © 0° 58! 81 i—23 "38 'N.32 E.' 1300 
