293 



solutions of the sesqui-chloricle, sesqui-biomitle, or sesqui- 

 iodide of iron are converted into the corresponding proto- 

 compounds of iron, by combining with iron, the heat in all 

 cases is the same for the same quantity of iron dissolved. 



The method by which these numerical results were ob- 

 tained, and the apparatus employed, are minutely described 

 in the original communication. 



Dr. Kane inquired how far he considered the final results 

 obtained by Dr. Andrews to affect the ideas of thermo-che- 

 mical combination, founded on the experiments of Despretz 

 and Dulong? 



Dr. Apjohn stated that the results of Dr. Andrews were 

 quite opposed to their experiments, as he found the quanti- 

 ties of heat not to bear any relation to the atomic weight of 

 the combining bodies. 



The Secretary read a paper by the Rev. Edward Hincks 

 " on the Chronology of the Eighteenth Dynasty of Manetho." 



The object of this paper is to determine the period at 

 which the eighteenth dynasty of Manetho flourished, by the 

 recorded dates, in months of the wandering year, of facts, 

 which must, from their nature, have occurred at known sea- 

 sons of the solar year. Three such dates are brought for- 

 ward : two of them relating to the time of the commencement 

 of campaigns ; and the thirds to that of the inundation : and 

 they all concur in depressing the epochs of the eighteenth 

 dynasty about 350 years below those, which the Cham- 

 poUions and Rosellini have adopted. An approximation to 

 the dates of the accession of many monarchs of the dynasty is 

 attempted. For example, the year B. C. 1278 is fixed upon 

 as very nearly, if not exactly, that of the accession of Ame- 

 nothph III. 



Mr. Mallet having become acquainted with the recent 

 improvements effected by Mr. Bessemer in the art of glass- 



