XXIV REPORT—1840. 
the History and present state of the Theory of the Undulations 
of Fluid and Elastic Media. 
The Report to be presented at the next meeting of the As- 
sociation. 
That Professor Kelland be requested to furnish a Report on 
the relative state of our experimental and mathematical know- 
ledge on the subject of the Conduction of Heat; to point out 
‘the experiments already made which require repetition, and 
those which are necessary to complete the comparison of Theory 
and Experiment. 
The Report to be presented at the next meeting of the As- 
sociation. 
That Professor Bache be requested to furnish his Report on 
the Meteorology of the United States for the next meeting of 
the Association. 
That a Committee, consisting of Mr. Lubbock, Sir J. W. 
Herschel, Dr. Robinson, Professor Forbes, Professor Whewell, 
Professor Miller, Sir David Brewster, and Major Sabine, be 
requested to report to the Association how far the Desiderata 
in our knowledge of the condition of the upper strata of the 
Atmosphere may be supplied by means of ascents in balloons 
or otherwise ; to ascertain the probable expense of such experi- 
ments, and draw up directions for observers in such circum- 
stances. 
The Report to be presented at the next meeting of the As- 
sociation. 
That Professor Johnston be requested to furnish the Report 
on Inorganic Chemistry, formerly requested. 
That Professor de la Rive, of Geneva, be requested to furnish 
the Report on the recent progress and present condition 
of Electro-Chemistry and Electro-Magnetism, formerly re- 
quested. 
The Report to be presented at the next meeting of the As- 
sociation. 
That Professor Johnston be requested to continue his re- 
searches upon Chemical Geology, and to direct his attention 
particularly to the effects of igneous rocks. 
That Dr. Daubeny be requested to prepare a Report on the 
connexion of Chemistry and Agriculture, formerly requested. 
