OF THE WIND AND BAROMETRIC PRESSURE AT BOMBAY. 
5 
maxima, and attains its maximum west positions at about the same hours at which the 
barometer reaches its minima, and passes through zero at the times when the barometer 
passes through its mean positions. A strong reason for believing that these features 
are produced by the superposition of such a variation, is afforded by the mean diurnal 
variation of the east or west components of the wind for the months of July and August 
alone; for during these months the land- and sea-breeze' has almost entirely disappeared, 
because the difference between the daily ranges of temperature of the land and sea is 
then very small, and the wind variation then found is of the kind here described, and 
would, when superimposed upon the mean temperature-curve for the year, produce a 
curve having similar features to those enumerated as peculiar to the curve which repre- 
sents the land- and sea-breeze. The variation is given in Table III., and also graphically 
represented by fig. 7. 
Table III. — Mean velocities of the north or south and east or west components of the 
wind at Bombay for each hour of the day in the months of July and August 1867 
to 1870 ; also the mean diurnal variations for the same period. 
Bombay Civil Hours 
0 to 1. 
1-2. 
2-3. 
3-4. 
4-5. 
5-6. 
6-7. 
7-8. 
N. or S. component 
5-67 s. 
5-47 s. 
5 -33 s. 
5-33 s. 
4-85 s. 
4 -36 s. 
4-43 s. 
4-87 s. 
Variation 
102 s. 
0-82 s. 
0-68 s. 
0-68 s. 
0-20 s. 
0-29 n. 
0-22 n. 
0 22 s. 
E. or W. component 
15 ’64 \v. 
1611 w. 
16 03 w. 
16-07 w. 
15-80 w. 
1578 w. 
1472 w. 
14-90 w. 
Variation 
0-47 e. 
000 
0 08 e. 
0 04 e. 
0 31 e. 
0-33 e. 
1-39 e. 
1-21 E. 
Bombay Civil Hours 
8-9. 
9-10. 
10-11. 
11-12. 
12-13. 
13-14. 
14-15. 
15-16. 
N. or S. component 
4-42 s. 
451 s. 
4-97 s. 
4-77 s. 
4-39 s. 
4-19 s. 
4-41 s. 
3-97 s. 
Variation 
0 23 n. 
0 14 n. 
0 32 s. 
012 s. 
0-26 n. 
0-46 n. 
0 24 n. 
0-68 n. 
E. or W. component 
14-81 w. 
14-98 w. 
1576 w. 
1 6 44 w. 
17'42 w. 
17-39 w. 
17-90 w. 
17-90 w. 
Variation 
1-30 e. 
M3 e. 
0-35 e. 
0-33 w. 
1-31 w. 
1-28 w. 
179 w. 
179 w. 
Bombay Civil Hours 
16-17. 
17-18. 
18-19. 
19-20. 
20-21. 
21-22. 
22-23. 
23-0. 
N. or S. component 
3-71 s. 
3-78 s. 
3-90 s. 
4-29 s. 
4-57 s. 
4 86 s. 
5-26 s. 
5-29 s. 
Variation 
0 94 n. 
0-87 n. 
0-75 n. 
0-36 n. 
0-08 n. 
0-21 s. 
0 61 s. 
0-64 s. 
E. or W. component 
17 71 w. 
1731 w. 
16-41 w. 
15-66 w. 
16-25 w. 
15-23 w. 
15-33 w. 
15 00 w. 
Variation 
1 60 w. 
1-20 w. 
0 30 w. 
0-45 e. 
014 w. 
0-88 e. 
0-78 e. 
Ml E. 
The mean components for the whole period are 46'5 S. and 16T1 W. 
During these two months the south-west monsoon is at its height at Bombay, and the 
wind is more boisterous and irregular in strength, though not in direction, than at any 
other part of the year ; the observations are consequently insufficient to give a very 
regular curve, but it is sufficiently regular to justify conclusions being drawn from its 
