330 Account of a Cyclone in the Andaman Sea. [No. 4. 



the 92° and 98° E. longitude. There is no doubt it must have 

 extended to the west of 92° E. longitude on the 8th and 9th, but, 

 no observations being available, I will not go beyond that limit. 

 In this region the polar current prevailed before the commencement 

 of the gale, as shown by the observations of the Semiramis, Port 

 Blair and Mutlah before the 7th and of the Alma and Coromandel 

 on the 8th (Amherst and Bangoon, vide Appendix.) On the 7th 

 and 8th a south-eastern current from the equator first entered the 

 south-western quarter of the region between 93° and 95° latitude. 

 {Semiramis and Mutlah on the 7th) at a time, when in the eastern 

 half the polar current still prevailed {Semiramis, Coromandel and 

 Alma on 8th.) The entrance of the southern current seems to 

 have introduced the atmospheric disturbance, but the rotatory motion 

 was not observed before the 9th and 10th, when the Cyclone had 

 been formed, travelling now from S. W. to N. E. The Mutlah? s log 

 makes it probable that the Cyclone took its origin west of the 

 middle Andaman on the 8th. 



After the Cyclone had passed, the prevailing winds in the region 

 were westerly, with calms, and later the polar current prevailed 

 again. 



To the south-west of the region (latitude 6° 10' longitude 

 88°— 90° ship Edwards) on the 8th and 9th S. westerly winds pre- 

 vailed, giving way on the 10th to the polar current. 



To the north of the region (Dalhousie, Calcutta and Sea and Cape 

 of Good Hope, forenoon of 9th.) The S. W. sea breeze common to 

 the coast of Bengal and Arracan, prevailed before as well as after 

 the gale (Dalhousie, Calcutta to 16° 51' N. latitude and 92° 16' E. 

 longitude from 7th to 11th.) The log of the Edward shows that 

 the south-eastern current, which ushered in the Cyclone, was con- 

 fined between very narrow limits, not reaching west of the Auda- 

 mans. It was on the 7th probably confined between longitude 92° 

 and 95° or 96° east longitude. 



