120 Mr. Colebrooke’s Meteorological Observations 
uniform in sea and air. Much discordance does not ordinarily 
occur, unattended by change of wind. 
The most striking instances, which fell under my notice, 
were in the southern hemisphere*. Within the same parallel 
of latitude (32° 40’ to 33° 40’) the temperature of the air, 
which had suddenly fallen not less than 5° on passing from a 
north-west gale ‘to a south-west breeze, ‘and which as quickly 
rose just so many, on reverting next day from this to a strong 
north-westerly breeze, sunk twice as much (10°) upon a violent 
shift of wind to south-west, and thence to south-east and east. 
The alteration of temperature of the sea, though not quite 
keeping pace with that of the atmosphere, was considerable, 
amounting to 4° and 5°. The variance of temperature of sea 
and air was consequently conspicuous; it was so much as 6° 
one day. 
In the northern hemisphere, I had occasion to remark a sud- 
den fall of temperature of both sea and air, attending a change 
from a south-western breeze to a northern gale. 
In a different instance the temperature of the air was affected 
by a shift of wind, with no correspondent change in the 
sea. 
Both are common cases; but I refer to instances in which 
the contrast was striking. 
Such discordant variations of heat in the sea’s surface and 
superincumbent atmosphere, mark a shift of wind. Concur- 
rent changes of temperature of both indicate transition from a 
tract in which one wind was prevalent, to another where a dif- 
ferent one prevails. In the first case, the wind has veered; in 
the second, the ship has passed from one wind’s range into 
that of another. 
. The temperature both of the. sea and of the atmosphere 
usually varies not much in the course of the day; and that of. 
the sea least. The diurnal variation of the air, unless in ex- 
traordinary instances of sudden transition, did not exceed 4°. 
_* 4th and sth Dec. 
