418 Reduction of Meteorological Tables in the Doah. 



portions of the varieties of weather to each other may be shewn as 

 follows : — 



No. of days of fine weather 



to that of cloudy days, with rain, as 5 to 1 

 „ to that of cloudy without rain, as to 1 



„ „ to that of partially fine, as to 1 



The winds that chiefly prevail throughout the whole year are 

 the Easterly and Westerly, the former being in the proportion to 

 the latter of nearly 3 to 2. In the more immediate vicinity of 

 the Siwalik Hills, about 10 or 12 miles to the North of Kulsea, the 

 winds appear to be curiously affected by local causes. At Badshah 

 Mahal, an old hunting palace of the Emperor Shah Jehan, situated 

 close to the bank of the river Jumna, the wind, as I am informed by 

 Mr. Pigott, sets in regularly every night all the year round from the 

 North, and appears to flow down the valley of the river. This current 

 is quite local, and may very possibly be caused by the colder air from 

 the hills flowing down to restore the atmospheric equilibrium, dis- 

 turbed by the greater heat of the adjoining sandy plains during the 

 day. The building is now in ruins, but in those portions where the 

 green sandstone of the Siwaliks has been employed, it is to be ob- 

 served much more weathered when it has a Northerly exposure than 

 when otherwise. 



I may here remark, how much it would facilitate the reduction of 

 observations on winds, were the method of reading off their direction 

 as from a graduated circle to be adopted, in preference to employing 

 simply the points of the compass. Not only would greater accuracy 

 of Registry be thus introduced, but a great deal of labour would be 

 saved in putting the observations in form to deduce general inferences 

 from them. This plan is now adopted by many observers, and in 

 practice, has several strong recommendations. 



I cannot observe, from the detailed Register, that either of the 

 prevailing winds had a greater tendency than the other, to bring rain 

 or any other change of weather, since variations of the latter seemed 

 to take place without any kind of perceptible connection with those 

 of the former. Rain, however, appears always to have accompanied a 

 North-west wind. 



