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The differences in the results of experiments with different acids, 

 the author observes, are not greater than usually occur in chemical 

 reactions, in consequence of the uncertainty that exists with regard 

 to the accurate proportions of chemical equivalents. He points out 

 various circumstances in experiments of this nature, which tend to 

 affect the results and lead to inaccurate conclusions, if care be not 

 taken to guard against these sources of error. One of the principal 

 of these is the heat which is generally evolved by the separation of 

 a base, or new compound, in a solid form : and the author discusses 

 the influence of this change on the results deduced from his experi- 

 ments. He considers that these experiments sufficiently establish the 

 general principle announced in the beginning of his paper. 



A supplementary note is added on the determination of the Spe- 

 cific Heat of Fluids. 



The Society then adjourned over the Christmas recess, to meet 

 again on the 11th of January, 1844. 



January 11, 1844. 

 The MARQUIS OF NORTHAMPTON, President, in the Chair. 



" An Account of a slight Shock of an Earthquake felt in the 

 Channel Islands." By J. Elliott Hoskins, M.D., F.R.S. : in a Letter 

 to P. M. Roget, M.D., Sec. R.S., &c. Communicated by Dr. Roget. 



The phenomena described in this letter occurred simultaneously in 

 Jersey, Guernsey, Alderney, Serk, Herne, and Jethore. On Friday, the 

 22nd of December, at seven minutes before 4 p.m., a noise resembling 

 a distant thunder-clap was heard ; tins was immediately followed by 

 sounds as of a railroad carriage rumbling over an irregular metallic 

 surface ; it was accompanied by distinct undulatory motion. This 

 again was succeeded by a shock; the whole lasting from 10 to 15 

 seconds. The barometer was uninfluenced, standing at 30*354 : a 

 light wind prevailed, varying from S.S.E. to S.S.W. During the 

 whole of the month the air had been peculiarly still, and the baro- 

 meter uniformly high ; the maximum, up to the above date, having 

 been 30*518, the minimum S0'042. The tliermometer had ranged 

 throughout the month, from 47° to 52° during the day, and from 

 45° to 49° during the night. 



