the Meteorology of Bombay : 



29 



in the clear season, 3°*7l in the clouded season, and 5°'l on the mean 

 of the whole year. 



When however we direct our attention to the gaseous pressure, we 

 perceive, very distinctly marked, the characters of a double progres- 

 sion, having one maximum at 10 h and another at 22 h ; one minimum 

 at 4 h and another at 16 h . The double progression is exhibited both 

 in the clouded and in the clear seasons, with a slight difference 

 only in the hours of maxima ; the principal maximum in the cloudy 

 season being at 20 h instead of 22 h , and the inferior maximum in the 

 clear season being at 12 h instead of 10 h . The range of the diurnal 

 variation, like that of the temperature, is more than twice as great in 

 the clear as in the clouded season, marking distinctly the connexion 

 subsisting between the phamomena of the temperature and of the 

 gaseous pressure. 



Table II. 



Bombay, 1843. — Comparison of the Temperature and of the Ga- 

 seous Pressure in the months of May, June, July and August, 

 when the sky is usually covered with clouds ; and in November, 

 December, January and February, when the sky is usually clear. 



If we now turn our attention to the phenomena of the direction 

 and force of the wind, we find by Dr. Buist's report, that for 200 

 days in the year there is a regular alternation of land and sea breezes. 

 The land breeze springs up usually about 10 h , or between 10 h and 

 14 h , blows strongest and freshest towards daybreak, and gradually 

 declines until about 22 h , at which time the direction of the aerial 

 currents changes, and there is generally a lull of an hour or an hour 

 and a half's duration. The sea breeze then sets in, the ripple on 

 the surface of the water indicating its commencement being first ob- 

 served close in shore, and extending itself gradually out to sea. The 

 sea breeze is freshest from 2 h to 4 h , and progressively declines in the 

 evening hours. 



