1849.] Eighteenth Memoir on the Law of Storms. 893 



been not quite 300 miles? or 150 miles of semi diameter on its 

 advancing semicircle, for the Sir Robert Seppings (11), and Framjee 

 Cowasjee (16) (this last with a pilot on board) had a heavy sea, squalls 

 and threatening appearances, but did not make their preparations for 

 bad weather till the afternoon : and if we refer again to the diagram 

 we shall find that at the centre of the wind circles we have a space, 

 marked by a double line, of 50 miles in breadth, within which are three 

 ships, in a small right angled triangle, of which the greatest side is 

 only 33 miles, with winds and weather at this time, as follows : 



f Faint variable airs from the S. W. Bar. fall- 

 9. Sea Park. < ing fast, birds, &c, taking refuge on the 



I ship. 



iq r> n- j f Wind variable from the N. W. Barometer 



13. Lollingwood. < * «. « 



17. John Hepburn. — Moderate and squally from the S. E. 



Two of these vessels also, the Hepburn and Collingwood, sighted 

 ships between daylight and noon under storm sail, and with top gallant 

 masts down.* 



It is evident then from these light opposing winds and dark gloomy 

 weather, with other phoenomenon prevailing within this tract, while a 

 gale and even a heavy gale was blowing around it, that these ships are 

 within a broad central space, which I have marked for the centre of the 

 Cyclone. I defer to the concluding remarks the strong evidence 

 which this affords not only of the fact that Cyclones are, as I have 

 already announced,f sometimes almost Zonal, when the proportions of 

 the central to the storm portion are considered, but moreover of the 

 fact that Cyclones are lifted up and descend again ! I take the centre 

 of the Cyclone then at noon this day to have been about in Lat. 1 7° 

 48' N. ; Long. 89° 18 ; East. And we should remark also that its 

 violence was not yet sufficient to dismast any of the vessels within its 

 influence. 



On the \3th October. — We have a diagram, which upon considering 

 some of the wind-arrows, appears rather an anomalous one, but we have 

 first to consider if the ships' positions are correctly laid down, and this 



* Probably the Victoria and three other outward-bound vessels, the logs of which 

 have not reached me. 



t Journal Asiatic Society, Vol. XIV. p. 907. 



5 z 



