542 A Twenty-third Memoir on the Law of Storms. [No. 6. 



from the first forming the Eastern quadrants of a Cyclone, they 

 finally were so, beyond question. There is nothing extraordinary in 

 this instance of Cyclones occurring about the same time, and travel- 

 ing up on parallel tracks,* as those who have paid attention to the 

 progress of Cyclonology well know. 



On the 22nd of Oct. — Following, first, the Light House Cyclone : 

 "We find the Ararat's Southerly gale still continuing and increasing 

 so much that at daylight, she very properly hove to again. She 

 notes at this time, and this is of much interest " a dense black bank 

 to the Westward" and this, I consider to have been indubitably the 

 body of this Cyclone. At noon she was in Lat. 19° 16' N. ; Long. 

 88° 2' East or 88 miles S. East of False Point Light House, where 

 the centre, preceded by the storm wave at 2h. 30' a. m. wind then 

 E. N. E. had already passed from 7h. 30' to 9h. 30' or say 8 a. m. 

 and the gale from E. N. E. had shifted and veered to S. W. At 

 Noon we find the Ararat had the wind at South, according to her 

 log, in which it is only entered at 3 a. m. but as she was, while lying 

 to, coming up to S. E. it is clear the wind was at least S. W. b. S. 

 at times with her. She had hove to at 8 a. m. and if we take her 

 drift to have been three miles per hour to the Northward, this will 

 place her at 8 a. m. in about Lat. 19° 06' N. and the Long, as before 

 88° 02' East, with the Light House bearing N. 43° "West. 



And we must take this position and the Light House report, on 

 which the fullest dependence can be placed, to fix the centre of this 

 Cyclone there for this day, and a circle with its centre at the Light 

 House as at 8 a. m. instead of at Noon, and the Cyclone circles 

 extending to the position of the Lord Petre and Luclcnow nearly 

 agrees with their winds, allowing for some little incurving, so that 

 at this time the two Cyclones of the 21st had united ? from which 

 we may deduce that the Eastern one was travelling over to the 

 Westward, and that it was probably at their junction that the Ameri- 

 can ship Portsmouth was dismasted. The log of this ship will be 

 found in the summary. 



We farther find that from 8 a. m. to Noon 'this day, the Cyclone 

 at the Light House had recommenced blowing " a complete hurri- 



* See for a remarkable instance of them in this very locality and also in the 

 month of October, the Ninth Memoir, Journ. As, Soc. Vol. XII. p. 771. 



