1887.] of the Surface Sea-water at the Sandheads. 19 



S. S. *' Nowsliera'' onwards to the N. W., some three or four miles an 

 hour faster over the ground than her dead reckoning showed her to be 

 going through the water, on her N". W. course towards the Pilot Station 

 and Hooghly River Sandheads, even all the way from the Alguada 

 Reef, and I found the following : — 



Temperature. Specific gravity. 

 Air. Sea. 

 November 22nd, 1886 7 A. m. Sea indigo. 



55 miles S. E. of Eastern Channel 



Light Station ... ... 81° 83° l-023i-f 



Note : — This temperature accords with, and 



the specific gravity exceeds what we 



had found at a distance of 200 miles, 



when bound the other way, only eight 



days before. 

 At 8-30 A. M. 14 miles S. E. of E. C. Light 



Vessel. Sea dark green 80'5° 1'022t\ 



At 10-10 A.M. 2 miles N. ISr. E. of E. C. 



Light Vessel. 1st quarter ebb ... 79-5° 79-5° 1-016^:^ 



Note : — This gives a difference of — 3°'5 in 



temperature and of -|- 006^^ in the 



specific gravity from what prevailed 



at, and near about the same spot, 



on the 13th inst. or only eight days 



before. 

 At 11*30 A. M. at Intermediate Light Sta- 

 tion. Half ebb ... 795° lOlS^V 



At 3 p. M. 2 miles above Saugor Light 



House S. W. ... ... ... 81° 81° 1-007 



We will now take the observations which were made at a position 

 near the Eastern Channel Light Station, and compare them, to show 

 what changes of density and temperature of the sea are there due to 

 these fitf al changes and disturbances of weather in the bay, during this 

 month of November last. 



Temperature, Specific gravity. 

 Air. Sea. 

 On the 81st October 1886, 2 miles N. E. of 

 E. C. Light, and just previous to a 

 cyclonic whirl in the Bay, with its 

 usual precursory westward set of the 

 sea at the Sandheads ... ... 845° 86=5° 1015/^ 



