2.54 Seventeenth Memoir on the Law of Storms. [March, 



the China Sea much frequented at that season of the year in which the 

 Palawan Passage is adopted, and is, though not of any great severity, 

 corroborative of the tendency of the tracks here to the Westward, I 

 have not thought it right to omit noting it, especially as the fall of the 

 Barometer was as much as 0. 4. in fifteen hours, and we have only 

 hereabouts, as yet, the two Cyclones of the American ship Panama, 

 laid down from Mr. Redfield, in the sixth of these Memoirs. 



Abridged Extract from the Log of the Barque Easurain, Capt. J. 

 Shire, from Singapore to China — reduced to Civil Time. 



The Easurain was on the 11th Nov. 1847 in 11° 40' North ; Long. 118° 45' 

 East ; Bar. 29.76 ; Ther . 84, with the wind W. b. N., a fresh breeze and squalls 

 to midnight, with a head swell ; vessel standing to the N. N. E. 



12th Nov. — a. m. the same to noon; wind hauling to N. West, when Lat. by 

 Acct. 12° 39' N. ; Long. 119° 27' E. ; Bar. 29.75 ; Ther. 86. and wind increas- 

 ing, p. m. Wind N. W. increasing to half a gale, with a high sea, and at night 

 threatening with hazy weather and drizzling rain ; prepared every thing for bad 

 weather. Midnight severe squalls with rain and furious gusts. 



13th Nov. — At 3 a. m. Bar. 29.35. At daylight the same weather; 7 a. m. 

 wind S. W., and at Noon W. S. W. when Lat. indiff. Obs. 13° 10' N.; Long. 

 119° 06' East; p. m, wind moderated at W. S. W. and South. 



On the Uth fine weather; Lat. 15° 07' ; Long. 119.0 East. 



It might at first sight be supposed that this Cyclone, occurring on the 

 same date and so near to that of the Rob Roy's just noticed, has some 

 connection with it, but it will be seen on comparing them that the Rob 

 Roy anchored at 6 p. m. on the 12th in a calm, while at this time the 

 Easurain at 120 miles distant had already half a gale at N. W., and 

 that midnight only it was a hard gale with the Rob Roy from about 

 N. N. W. to N. W., as well as we can judge from her note. The 

 veering of the wind also with the Easurain is that of a Cyclone travel- 

 ling out of the Straits of Mindoro, or of St. Bernadino, on a Westerly 

 course, and cannot be reconciled to the track supposed for the Rob 

 Roy's, which by its duration also (about 10 p. m. to 6 a. m.) was of 

 very small dimensions, or passing very rapidly, while the Easurain' s 

 lasted 20 to 24 hours. Had the two Cyclones been but one it must 

 have commenced sooner with the Rob Roy, and the shift or veering 

 with the Easurain should have been into the N. E. quadrant, and not 

 into the S. E. one. On all these grounds then I should take them as 



