xcvi General Results of the Makeestoun Obseevatioxs. 
Table 90. — Monthly Means of the Maximum Pressure of the Wind within 10™ at the Observation 
Hours for the Years 1843-6. 
Year. 
Jan. 
Feb. 
March. 
xVpril. 
May. 
June. 
July, 
Aug. 
Sept. 
Oct. 
Nov. 
Dec. 
Mean. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
lb. 
1843 
1-29 
0-87 
0-32 
0-49 
0-39 
0-40 
0-35 
0-17 
0-16 
0-42 
0-48 
0-72 
1 0-50 
1844 
0-34 
0-37 
0-52 
0-41 
0-20 
0-50 
0-16 
0-37 
0-34 
0-57 
063 
0-09 
0-37 
1845 
0-45 
0-52 
0-81 
0-61 
0-67 
0-56 
0-39 
0-38 
0-28 
0-63 
0 51 
0-97 
' 0-56 
1846 
0-48 
0-47 
0-61 
0-35 
0-54 
0-36 
0-49 
0-19 
0-18 
0-42 
0-46 
0-36 
1 0-41 
Mean 
0-64 
0-56 
0-o6 
0-46 
0-45 
0-45 
0-35 
0-28 
0-24 
0-51 
0-52 
0o3 
0.46 
199. Annual Variation of the Approximate Mean Pressures of the Winrl, — From the means of 4 years' 
observations, the wind blew with the greatest mean force in January, and with the least mean force in Septem- 
ber. The mean pressure, however, varies little for the six months October to March, while the sun is south 
of the equator ; it is nearly constant for the three months, April, May, and June, diminishing gi-adually from 
June to September. September is the month of least pressure in each year, excepting 1844 ; the month of 
maximum pressure is more variable, January in 1843, November in 1844, December in 1845, and March in 
1846. 
Table 91. — Variations of the Pressure of the Wind with reference to the Moon's Age and Declina- 
tion for the Years 1843-6. 
Moon's 
Age. 
1843. 
1844. 
1845. 
1846. 
Mean. 
After j 
Moon 
farthest 
North. 
1843. 
1844. 
1 
1845. 
1846. ' 
Mean. 
d. d. 
lb. 
lb. 
lb. 
lb. 
lb. 
d. d. 
lb. 
lb. 
lb. 
lb. 
lb. 
14—16 
+ 0-03 
-0-16 
-0-09 
-0-08 
-0-07 
27— 1 
-0-06 
+ 0-32 
+ 0-06 
-f-0-05 
+ 0-09 
17—20 
-0-18 
+ 0.04 
+ 0-17 
+ 0-03 
+ 0-02 
2— 5 i 
-0-11 
-0-01 
+ 0-02 
-0-04 
-0-03 
21—24 
-0-06 
+ 0-18 
-0-01 
-0-03 
+ 0-02 
6— 8 j 
-0-01 
-0-02 
-0-10 
-0-01 
-0-03 
25—28 
+ 0-05 
+ 0-10 
+ 0-05 
-0-10 
+ 0-02 
9—12 
-hO-02 
-0-07 
-0-06 
+ 0-08 
-0-01 
29— 1 
+ 0-20 
0-00 
+ 0-17 
+ 0-07 
+ 0-11 
13—15 
+ 0-08 
-0-17 
+ 0-04 
-003 
-0-02 
2— 5 
+ 0-07 
-O-OS 
-0-03 
+ 0-13 
+ 0-02 
16—19 
-t-O-12 
-0-04 
+ 0-04 
-0-12 
0-00 
6— 9 
-0-04 
+ 0-04 
-0-07 
-0-01 
-0-02 
20—22 
+ 0-05 
-0-10 
-015 
4-0-03 
-004 
10—13 
-0-08 
-0-15 
-0-15 
-0-01 
-0-10 
23—26 
-0-09 
+ 0-07 
+ 0-16 
+ 0-07 ^ 
+ 005 
200. Approximate Mean Pressure of Wind luith Reference to the Moon^s Age. — The mean result from the 
first portion of Table 91 shews, that the pressure of the luind was a ma.vimum at conjioiction and a minimum near 
opposition. The result for each year shews a well-marked minimum neai* opposition, and a maximxmi near 
conjunction. It has ali'eady been noticed (No. 194), that the diurnal range of the atmospheric prossiu'e obeys 
a sunilar law ; that is to say, for this argument, the diurnal oscillation of the statical presstu-e of the atmosphere 
is a maximum wlicu its dynamical pressure is a maximum. 
201. Approximate Mean Pressure of the Wind ivith licfercnce to the Moon^s Declination. — From the last 
column of Table 91, the mean result of 4 years' observations, it appears that the pressure of the wind is a maximum 
when the moon is farthest north. This result is she^vu with some distinctness in each year, excepting in 1843, 
for which tlic maximum occurs when the moon is farthest south ; there is, however, the appearance of a maxi- 
mum near the time of the moon's fartliest sontlierly position in tlie years 1845 and 1846 ; and, indeed, in the 
mean for the 4 years ; it is probable therefore that the minimum pressure of the wind occurs when the moon 
is near the equator. The same relation, between the diurnal oscillation of the statical pressure of the atmos- 
plicro and its dynamical pressure, holds as in No. 200. 
