74 Proceedings of Societies. [Feb. 



4. — Hourly Observations of the Barometer in the Fortress of Cavite. 



The following notice, extracted from the Royal Institution Journal, No. IV. 

 hears upon the same point ; and from the blank left opposite to the second fall, 

 we may conjecture, that in fact the existence of this fall or nocturnal tide was 

 hardly borne out by the observations when corrected for temperature, although 

 from being apparent before correction the words remained unerased. 



These observations were made by the scientific men attached to Captain Kotze- 

 bue's expedition in the year 1823—1826, on the Island of Luzon (14° 34' north 

 lat. and 239° 9' west of Greenwich), for ascertaining the periods of its regular 

 falling and rising during twenty-four hours. The barometer was kept in a room 

 six toises above the level of the sea, in which the temperature was nearly the same 

 day and night, (about 25° Centigrade, or 77 Fahr.) and the observations were 

 made on eleven different days between the 12th and 26th of December. The fol- 

 lowing are the general results deduced from the whole of the observations. The 

 barometer has a maximum of height at 9° 1' 1" a. m. 



it then falls till 4 28 6 p. m. on an average 1.04 line; 



it rises again till 9 58 3 p. m. „ 0.687 „ 



and falls again till 4 30 a. m. 



lastly, it rises again till 9 1 1 a. m. on an average 0.445 



5. — Dr. Wise's Ice Manufacture at Hiigli. 

 Dr. Wise hopes to maintain a constant supply of ice, in Culcutta, for the next 

 two or three months. Last cold season, although apparently so favorable for its 

 production, did not afford more than 15 nights in which ice would form ; and of 

 these, only three or four were really good nights. In consequence of this, instead of 

 3,000 mans, as expected, only 1,000 mans were secured ; which, from the precautions 

 taken, will, perhaps, answer for several months. Dr. W. has devised the following 

 simple and effectual method of using the ice. The ice is contained in a stuffed bag, 

 having two, three, or four holes in its under-part, with padded flaps to close them. 

 The necks of the bottles to be cooled are thrust upwards through these holes ; 

 when not wanted, the bag is put into the upper part of a stuffed basket and wrap- 

 ped round with a blanket. 



VI. — Proceedings of Societies. 



1. — Asiatic Society. — Physical Class. 



Wednesday Evening, 8th February, 1832. 



The Honorable Sir Edward Ryan, President, in the Chair. 



The following Donations to the Museum were presented : 



1. Specimens of the Limestone of the Sylhet quarries, from William Cracroft, 

 Esq. 



Impressions of nummulites abound in the limestone of the Chirra hill, west 

 of the Sanatarium. Turrilites are less common, and impressions of bivalves, 

 resembling pectens, are still more rare. The interior of the shells is filled with 

 carbonate of lime, crystallized, of a brown colour. 



No. 5. A granular limestone, stated, in Mr. Cracroft's list, to be " a poorer lime 

 than the others in the kiln," proves to be a crystallized dolomite ; and this cir- 

 cumstance accounts for the occasional mixture of magnesia in the Sylhet lime of 

 the Calcutta market. 



