170 The Temperature of the Surface of the Ocean. [No. 2. 



A Register of the Temperature of the Surface of the Ocean from the 

 Hooghly to the Thames. — By A. Campbell, Esq., M. D. 



To Major H. L. Thuillier, — Deputy Surveyor General, Calcutta. 



Sir, — On leaving India for England in February 1856 I received 



through your prompt and kind assistance two Thermometers from 



Government to enable me to keep a register of the temperatures of 



the ocean for M. Hermann Schlagiutweit, and the Asiatic Society. 



I kept the register faithfully all through the voyage from the 



Sandheads of the Hooghly till we entered the Thames, a copy of this 



register with a chart of the voy- 

 * Shewing the daily position of the f ^ A mnon * was for . 



Ship at ISoon. ° ■> 



warded with the annexed letter 



to Colonel Sykes, the Chairman of the Honorable the Court of 



Directors, and I have the pleasure to forward a duplicate of it for 



the information of the Asiatic Society. 



For the delay in doing so, the Society will, I hope, excuse me. 



The period that has elapsed since I rejoined my station in the end 



of May last, has not been favourable to thinking of such matters. 



I am, yours very truly, 



A. Campbell, M. D. 



Darjeellny, January 21st, 1858. 



To Colonel Sykes, Chairman, Sfc, East India House, London. 

 Sir, — Previous to my departure from India I was requested by 

 H. Hermann Schlagiutweit to keep a register of the temperature of 

 the surface of the ocean on the voyage round the Cape of Good 

 Hope, as such a register was a great desideratum to him in connec- 

 tion with his other Meteorological researches in the East. 



2. Having been furnished with Instruments for the purpose by 

 the Government of India, I made the required observations, which 

 are herewith forwarded, and have now to request that you will do me 

 the favor to take charge of them for Mr. Schlagiutweit. 



I have the honor, &c, 

 (Signed) A. Campbell, M. D. 

 Memoranda on the Register. 



1. Register commenced on the day after we left the Pilot, 21st 

 February, 1856. 



2. On the 2nd of March at the time of both observations the 

 temperature of the sea was 2° higher than that of the air, viz. 82° 

 mid 81°. This bein<2r the first time I had observed this result. I 



