626 
ME. H. F. BLANFOED ON THE WINDS OF NOETHEEN INDIA. 
and 25th a north-east wind set in in Bengal and down the west of the Bay, displacing the 
south-east wind, which, however, continued to be felt in the immediate neighbourhood 
of the Nicobars ; and the cyclone-vortex was formed by the indraught of these three 
currents to the preexisting area of barometric depression. 
III. “ The storm of the 13th to the 17th* May, 1869, originated near Cape Negrais on 
the first of these days. A south-west breeze had been blowing pretty steadily over the 
greater part of the Bay for some days before, the mean direction being south-south-west 
in the north of the Bay, south-west in the middle, and west-south-west in the south.” 
Only “ in the neighbourhood of the Andamans, Cape Negrais, and Rangoon a northerly 
or north-westerly wind was felt occasionally during the ten days previous ; but it was 
unaccompanied by any fall of temperature, and would seem to have been a local deflection 
of the south-west current.” “ Some observations of pressure in the neighbourhood of 
Cape Negrais would seem to indicate the existence of a slight barometric depression in 
the Gulf of Martaban and to the west and north of Cape Negrais, hut the instruments 
were not sufficiently trustworthy to establish the fact in a satisfactory manner.” 
IV. The storm of the 5th to the 10th Junef of the same year was apparently formed 
in the middle of the Bay, in about 16° north latitude. At Port Blair the wind had 
been steady from south and south-west for two or three days ; at Chittagong and Akyab 
southerly, with alternations of land- and sea-breezes ; at Saugor Island south ; at False 
Point south-east ; and a steamer crossing the head of the Bay from Calcutta to Akyab 
had a steady south-east breeze. Around the coasts, the pressure was lowest at Saugor 
Island on the 4th, when it was 0T below that at Port Blair, i. e. rather less than the 
normal difference in this month. On the 5th the difference was reduced one half of this ; 
but in the middle of the Bay, when the storm originated, the barometer stood at more 
than 0 - 2 inch lower than at Saugor Island, and there is evidence of the winds beginning 
on that day to curve in around the local depression. 
V. The cyclone of the 7th and 8th October of the same year J commenced in the 
northern part of the Bay on the morning of the former day. At Port Blair the wind 
had been steady from the south-west for several days, and the barometer had not varied 
more than -03 inch on the mean of the day from the 2nd to the 6th. At Akyab the 
barometric change had been but little greater and the wind had been light from south- 
south-east, with one or two changes to north and east, for a few hours, which were pro- 
bably due to local causes. On the 6th it was steady from between south-south-east and 
south-west, blowing moderate to fresh. At Saugor Island the wind was light and from 
the south up to midnight of the 5th, after which a light wind set in from east-north- 
east and continued without much change till sunset of the 6th. At False Point the 
barometer had been steady and the wind south-east or east. In the south of the Bay 
the wind had been from west or west-south-west for several days and the weather 
squally ; this appears to be always the case before a cyclone. 
VI. The Yizagapatam storm of the 5th November, 1 870 §, probably commenced on 
* Meteorological Eeport for Bengal, 1869, p. 102. t lb., p. 103. $ lb., p. 107. § lb., 1870, p. 116. 
