426 Prosmia offered for investigations on various subjects, [April 



ris, Esq., Prof. Powell, Col. Sykes, and Prof. Phillips, who will 



act as Secretary. 



500/. Enlarged grant for the procurement of accurate Data to determine 

 the question of the Permanence or Variability of the Relative 

 Level of Land and Sea. The Committee consists of Mr. Baily, 

 Mr. Dc la Beche, Col. Colby, Mr. Cubitt, Mr. Greenough, Mr. 

 Griffith, Mr. Lubbock, Capt. Portlock, Mr. G. Rennie, Rev. Dr. 

 Robinson, Prof. Sedgwick, Mr. Stevenson, and Rev. Win. Whe- 

 well, who will act as Secretary. 



100/. For Experimental Investigations on the Form of Waves ; at the 

 disposal of John Robison, Esq., and J. S. Russell, Esq. 



500/. Renewed grant for the Reduction of Observations in the Hist. 

 Celeste and in the volumes of the Academie des Sciences for 1789 

 and 1790; under the direction of the Astronomer Royal, F. 

 Baily, Esq., J. W. Lubbock, Esq., and Rev. Dr. Robinson, j 



150/. For Experiments on Vitrification ; under the direction of Dr. Fa- 

 raday, Rev. W. V. Harcourt, and Dr. Turner. 

 80/. Renewed grant for the construction of a rock-salt Lens ; under the 

 direction of Sir D. Brewster. 



Chemical and Mineralogical Science. 



50/. Renewed grant for Researches on the Specific Gravity of Gases ; 



under the direction of Dr. Dalton and Dr. C. Henry. 

 30/. For Researches on the Quantities of Heat developed in Combustion 



and other chemical Combinations ; at the disposal of Dr. Turner. 

 15/. For Researches on the Composition of Atmospheric Air ; at the 



disposal of Dr. Dalton, and Mr. W. West. 

 24/. 13/. For the publication of Tables of Chemical Constants drawn 



up by Prof. Johnston. 

 60/. For Researches on the Strength of Iron made with hot and cold 



blast ; at the disposal of Messrs. Fairburn and Hodgkinson. 



Geology and Geography. 



20/. Renewed grant for Experiments on the Quantity of Mud suspend- 

 ed in the water of Rivers ; under the direction of Mr. De la 

 Beche, Mr. G. Rennie, and Rev. J. Yates. 



30/. For special Researches on Subterranean Temperature and Elec- 

 tricity ; at the disposal of Mr. R. W. Fox. 



50/. For Researches into the Nature and Origin of Peat Mosses in 

 Ireland ; under the direction of Col. Colby. 



