1852.] • On the Meteorology of Rampore Bauleah. 595 



part of the day it is lower still (3| p. m. 109°), an effect no doubt 

 due to the vapours raised by the sun, and which equally interfere with 

 the Photometer observations." 



The observations subsequently recorded and exhibited in the diagram, 

 will not be found to agree with this, as in three months out of five the 

 Maximum reading in sun's rays was obtained at 4 p. m. and the Mean 

 Maximum in two months out of five of that hour. The mean of 

 Black Bulb Thermometer has been in every case computed from 

 observations made under a cloudless sky, or at least one in which no 

 visible barrier interfered with the direct solar rays. Even under 

 these conditions, however, the mercury exhihited great varieties in 

 height— a fact due, I presume, to some passing haze not visible to the 

 eye. It is worthy of being noted that on every occasion on which 

 the sky became obscured with dark heavy storm clouds, the reading of 

 Black Bulb fell to the same level with that of the Thermometer in 

 shade, proving their impenetrability to even the fierce sun of the 

 Tropics. 



In the absence of an Anemometer all record of the "wind's force" 

 must be defective. The mean strength for the year tested by the 

 Admiralty scale, would not be considerable. The characteristic storm- 

 cloud consisting of one long roll of cloud, often stretching from one 

 point of the sensible horizon to the other, generally known by the 

 name of North-Wester, by no means invariably come from that 

 quarter. The originating points stood in the following order as regards 

 frequency: 1. North-West; 2. West; 3. South-West; 4. So°uth ; 

 5. South-East. Their rate of movement is deserving of investigation! 

 The wind accompanying them is frequently not sensible, until the 

 anterior part of the storm-cloud has passed the zenith. They are not 

 invariably accompanied by rain. It would be interesting to ascertain 

 the points and modes of origin of these peculiar storm-clouds. Their 

 existence and advent are common in every part of Bengal, but we 

 possess no knowledge of their commencement. Again how far do 

 they continue in their course unbroken ? As well as I have been able 

 to trace them from one sensible horizon to the other no change occurs 

 in their formation. 



The total rain-fall for the year was only 34.6 J, and the number of 

 days in which rain fell 56. 



4 c 



