Rin Rite ee ee 8 Co ae ee Se a. oe 393 
woLicat é7 t10ONS At sO, Unio. 
The force of the wind is least at 4 A. M. and greatest at 1 
P.M.; the latter being 2.63 times the former. The curve 
iiprecenstinag these observations is found to be almost identical 
with that of the thermometer, not only for the whole year but 
for each season. This result-develops a most important: prin- 
ciple, and demonstrates the error of those: who-ascribe to» heat 
an unimportant influence in the production and modification of 
winds. It is here demonstrated by direct observation, that at 
certain localities, and there is good reason to believe that in this 
Tespect they are not peculiar, the wind is subject to a controlling 
influence, which has a period of twenty four hours ; an influence 
hot feeble or of doubtful existence ; but pawerfals at one hour 
retarding it by nearly one half its mean velocity, and at another 
accelerating it by the same quantity ; changing not merely its in- 
tensity but its direction, for from the table on page 320, it will 
be seen that the wind is more northerly at 3 P.M. than at 9 A. M. 
for every month of the year. Taking these facts in connection 
with the well ‘known’ effects of heat, we ai ate warranted in the 
conclusion that the 1 wer of the EES 
garded as the physicabeaiase. of: this dial | eliange ith the dire 
tion and intensity of the winds => ' 
CLOUDS. eal Piagiers eins 28:08 
“The following table exhibits the ieee “of thit-aletede, cst 
observation being resolved in the direction of the cardinal points 
in the same manner as for the winds.. The table contains the 
sum of the ea ica for thee yee ; 
ca: 
.. we p Course, 
3.41) 35,35 n, 84° 4’ w,] 
71) 36.15 “ 85 52 © 
6.01) 36.498. 75 28 * 
? Lol) 54.81n. 88 3 « 
: 8.46 55.22 N. 76 55 “ 
51; 6.12 41.90 s. 89:50°* 
50.838. 2.57, 52.35 x. 86 30 “ 
45.82" | 4.83) 50.65's. 80°22 
24 yf 1% 50.04 4 83 38 “ : 
53.66" 80 20 « 68) 29.78} 6.37° 59.49" 76 9 © 
54.55 81 4. | 14.61| 19.12) 1.92) 51,60)" 84 49. +. 
70 539.48|s.88 39 w. 216.99 237.02135,23 581.55] s. 87 49 w, 
yen thn that he men det fh slo rh 
month is very ney fom. the west So Rain the 
Sreatest deviation. ‘The clouds are all of ty supposed to 
