1849.] Seventeenth Memoir on the Law of Storms. 253 



Tyfoon, in which she was nearly driven from her anchors, and wrecked 

 at the entrance of Manila Bay. At Manila this Cyclone was very des- 

 tructive. 



Abridged extract from the Log of the Barque Rob Roy, Capt. Francis. 



Civil Time. 



On the 12th November the Rob Roy anchored at 6 p. m. in a calm in 22 

 fs. at the entrance of Manila Bay, with the flagstaff on Corregidor bearing 

 S. S. E. and veered to 45 fs. ; a strong breeze springing up from the N. W. 

 let go best bower and veered to 90 fs. on small and 75 on best bower. Midnight 

 hard gale with dark gloomy weather ; sea washing over the vessel fore and aft. 

 Bar. marked 29.80 6 p. m. ; 29.50 at 8^ ; 29.30 at 11, 29. 20 at 1 a. m. 



lZth Nov. — 1 a. m. small bower parted. At 2 the height of the Tyfoon, Ther. 

 78°, Bar. 29.20 ; at 4 more moderate ; 11 a. m. weighed and made sail for Manila. 



During the Tyfoon the wind was from N. N. W. to N. E. b. N. and died 

 away at S. W. 



Remarks. 



This veering of the wind would seem to indicate a track from the 

 N. ^ E. to the S. ^ W., but we are rather embarrassed to judge of it by 

 what follows, that it "died away at S. S. W." which would make the 

 Cyclone curve up to the N. W. round Punta Luzon, unless we consider 

 the vessel's position, which was that of being anchored in a narrow chan- 

 nel, and during the whole time under the lee of the high mountain, 

 of Maribeles, the termination of the lofty coast chain which runs 

 down to the Bay of Manila. The Island of Corregidor also, so near to 

 which the vessel was latterly drifted, that as Captain Francis informs 

 me, the back wave from the rocks was felt, is high, and thus the vessel 

 was completely under its lee when the wind came in that direction. The 

 winds moreover in the entrance to a large bay like that of Manila, may 

 be so variously deflected by the coasts that unless blowing with violence 

 we can scarcely venture upon any deduction. 



I have thus marked this track as one coming down from the N. ^ 

 E. to the S. \ W. The seaman will understand however that this is 

 to some extent conjectural. 



Barque Easurain's Cyclone off the Mindoro Channel, and Straits of 



St. Bernadino. 



I obtained the Log of this Cyclone after my chart was completed, 

 and have thus been unable to include it, but as it occurred in a part of 



