192 A Twenty- Fifth Memoir on the Law of Storms. [No. 2. 



had the centre passing her, and that it was veering (or shifting says 

 the log) so rapidly at 1.30 p. m. to N. N. W. from E. S. E. that it 

 was not more than five minutes in doing so. Hence there is no 

 doubt that the centre passed close to the Eastward of her, and 

 doubtless, as estimated in the reports from thence, somewhere be- 

 tween Rangoon and the Sitang river-mouths, about 45 miles to the 

 East of her. If we say that the centre bore due East 20 miles 

 from the Tavofs position at 1 p. M. we shall then have, from its 

 estimated place with the Pluto at 7 a. m. to this spot at 1 p. m., a 

 distance of about 70 miles for its progress in six hours, or llf- miles 

 per hour for its rate of travelling, which is not an unusual one, and 

 one founded on fairly estimated data is, I think, far preferable to 

 the forced conclusion of supposing the Aratoon Jpcar's Cyclone to 

 have travelled at the rate of thirty -two miles per hour ? 



We have thus the remarkable fact of a small but severe Cyclone 

 forming, or descending perhaps, about Narcondam, since it dismast- 

 ed the Laidmans probably at some distance W. S. West of the spot 

 where its centre passed over the Pluto and travelling up to the 

 N. East and our Chart, on which I have placed for comparison the 

 former tracks of the Briton and Punnimede s and of the Prints 

 Cyclones, will shew that, in confined Volcanic seas like this, the 

 tracks are apparently subject to no general rule, at least to none that 

 we can at present venture to predicate. 



Other Phenomena. 



There was in this Cyclone the usual absence of thunder and the 

 faint lightning described seems to have been more the glaring of 

 strong electrical action than true lightning. 



The frothing of the sea during the passage of the centre is by 

 far the most remarkable phenomenon in this Cyclone, and I have 

 endeavoured to elicit, as will be seen in the queries, all possible in- 

 formation regarding it, and Captain Boon and his officers all agree 

 together in comparing the motion of the sea to the seething of a 

 cauldron. I think this has been noticed before ? but I cannot now 

 find the reference, and on one occasion in the S. East part of the 

 China Sea between the shoals and the coasts of Borneo, in the month 

 of October after several days of gloomy rainy weather, perhaps from 

 a Cyclone in the Northern part of the sea, I myself observed it to 



