1858.] A Twenty-Fifth Memoir on tlie Law of Storms. 191 



have approximately estimated about Barren Island, for the sup- 

 posed Cyclone of the Aratoon Apcar at midnight 22nd — 23rd of 

 May, to the spot where the centre certainly passed over the Pluto 

 at 7 a. M. on the 23rd is a distance of 222 miles, so that if suppose 

 the Cyclone to be the same storm, it must have travelled at the rate 

 of nearly 32 miles an hour, a far higher rate of travelling than we 

 have yet ascertained for the storms of the Bay of Bengal except in 

 one instance. 



The log of the Laidmans unfortunately affords us no assistance, as 

 no positions are given, but from what is said she appears to have 

 been dismasted very near to the centre, and not far to the S. 

 "Westward of the Pluto. 



It seems therefore safer to suppose that the Pluto's Cyclone was 

 an independent storm, and that that of the Aratoon Appear was also 

 possibly or probably a Cyclone, which either broke up or ran on ahead 

 of the vessel passing out, as in the case of the Erin's Cyclone, 

 Twenty-second Memoir Journ. Asiatic Society of Bengal Vol. XXIII. 

 by the Cocos passage. I have thus marked only a single circle for it, 

 at midnight 22ud — 23rd to remind the mariner of the great probabi- 

 lity of the Southern, S. "Western and South Eastern gales of the 

 open part of the Andaman Sea being quadrants of Cyclones of which 

 the track lies over or near to the two Volcanoes. 



We have then only to deal with the Pluto's Cyclone which evi- 

 dently, — and this constitutes its great interest, — came up from the 

 South West, and was travelling to the N. East. It appears to 

 have given as usual its first indications by the increasing swell from 

 the S. "West after Noon ; by midnight it was a gale from the S. 

 East ; but we have no data from which to estimate the distance of 

 the centre at this time, and can thus only mark for it also a circle 

 with a track of an undefined extent in the directions which we 

 fortunately know it to have taken, the centre of the circle being, as 

 nearly as can be estimated, the Pluto's position at 7 a. m. when the 

 calm centre passed her. 



We next find that at the Tavoy light vessel, which is anchored 

 off Elephant point in Lafc. 16° 19' N. ; Long. 96° 25' East at the 

 entrance of Eangoon E/tver, it commenced blowing very hard from 

 the E. S. Eust at 7.30 a. m. on the 23rd, about the time the Pluto 



