2. Ten Sovereigns, or a Piece of Plate of that value, for an 

 approved Essay on the Temperature, Colour, Chemical Composi- 

 tion, Mechanical admixture, Magnitude, Velocity, and Alluvial for- 

 mationsofany oneof the following Rivers in Scotland, viz. the Tweed, 

 Tay, Dee in Aberdeenshire, or Spey. — Time, February 1841. 



GEOLOGY. 



3. Ten Sovereigns, or a Piece of Plate of that value, for an 

 approved Essay on the Erratic Blocks or Boulders of Scotland and 

 its Islands. 



N. B. The Author will be expected to treat of the Mineralogi- 

 cal and Paleontological Characters, the Physical and Geographi- 

 cal Distribution of these Boulders, and, from the data thus afforded, 

 endeavour to account for their origin and distribution. A Map or 



Maps illustrative of their distribution will also be required Time, 



February 1841. 



4. Ten Sovereigns, or a Piece of Plate of that value, for an 

 approved Experimental and Practical Essay on the Mineralogical 

 Constitution, and Chemical Composition, of the Trap-Rocks of 

 Scotland. A collection of Specimens required — Time, February 

 1842. 



5. Ten Sovereigns, or a Piece of Plate of that value, for an 

 approved Experimental Essay on the Chemical Composition of 

 the so called Altered or Metamorphic Rocks met with in Granite, 

 Porphyry, Serpentine, and Trap districts. 



N.B. It is expected that the Author will, where necessary, exa- 

 mine chemically the Unaltered Rocks associated with the Altered. 

 Collection of Specimens required — Time, February 1842. 



6. Ten Sovereigns, or a Piece of Plate of that value, for an 

 approved Essay on the Fossil Organic Remains found in the Tran- 

 sition strata and carboniferous systems of Scotland. The new 

 or unfigured Species to be accompanied by Drawings. Collection 

 of Specimens required. — Time, February 1844. 



