396 Eighth Memoir on the [No. 137. 



before it at the rate of 3 J miles per hour, the least which we can allow 



for a disabled ship. This brings her to lat. 12° 36', long. 60° 38' E. 



as the spot where the centre passed her. 



We have from this point then, which is tolerably well ascertained, 



and which the storm reached at 8 a. m. on the 1st November, the 



following data in time and distance. 



Distance. Time. 



miles, days, hours. 



To the centre of the Futtay Salam's I 4Rn A 1Q 



hurricane, Noon 27th October, I ™ U 4 , , , u 



j or 114 h. 



or 4.2 per h. 



To the centre of the 25th at Noon, I q Q ,. fi ,~ 

 near the Palghautcherry Pass, j l fi-2 h 



or 6.1 per h. 



To the centre of the 24th to the I , 9qn » lp 

 Eastward of Madras f ' 



) or 186 h. 



or 6.6 per h. 



The mean of this is 5.6 per hour, or only one-half of what we allow- 

 ed it to have in crossing the peninsula, and less than half of what we 

 have proved it to have had in the Bay of Bengal ; but then we 

 must not forget, first, that it had to force its way over the peninsula, 

 and through 900 miles of distance in the Arabian Sea against the 

 S. W. Monsoon ; next that these sort of calculations and allow- 

 ances always assume some initial force or rate of motion ; and lastly, 

 that we know absolutely nothing at all of the cause either of the 

 rotatory or progressive forces, or of their opposing resistances and 

 retardation, or if they acquire, or have under any, or what, cir- 

 cumstances, the power of increasing the velocity of either of their 

 motions. 



Of all these things, and of much more which will readily occur 

 to men of science, we are profoundly ignorant, and as I have before said, 

 all we can now do is to register accurately, and deduce — when we 

 must deduce — doubtingly. 



The log of the Chieftain is the only one which now remains for us to 

 remark upon, and it will be evident that she was on the 2nd Novem- 

 ber just far enough within the verge of the vortex to feel the sea, and 

 have the threatening appearances with the wind veering as it would 



