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which take place during the process, and the causes of variation of the results, in the modes commonly practised An Honorary Medal.

16. For the best scientific account of the Action of Manures in increasing the productive powers of the Soil. The object of the paper being to lead to more certain rules of practice than those already known or followedAn Ho­norary Medal.

IN THE GENERAL DEPARTMENT.

17. For the best and cheapest Apparatus for producing Oil Gas on a scale sufficiently small fbr common Dwelling-Houses. The account to specify the average quantity of gas produced from a gallon of oil of a certain price An Honorary Medal.

1 ff. For the best Plan, in point of economy and salubrity, for Heating and Ventilating, applicable to common Dwelling-Houses. The account to specify the fuel consumed per diem; the size of the house heated; the temperature external and Internal in each stole) ; ami tlie-dixirensions of every part of the apparatus An Honorary Medal.

19. For the best specimens (prepared in Scotland) of Substances for the Con­struction of Economical Hoofs, similar to those described in Gills Technical Depository, No. 12, page 423An Honorary Medal.

29. For the best Specimen of lithographic Printing produced by Printers resident in Scotland A Gold Medal of L. 20, or a Medal of L. 10, and L. 10 in Money.

21. For the second best Ditto A Medal of L.h , and L. 1 in Money.

22. For the third Ditto A Medal of L. 3, and L.5 in Money.

N. B. These three last Prizes will be postponed to a future time , if there be not more than three Candidates , or if specimens of sufficient merit be not produced to the Satisfaction of the Menibcrs of the Association for the Improvement of Lithography.

As the Society of Arts intend to appropriate the whole of their disposable funds in forming Honorary Medals, they cannot fix tlieir value until they ascertain the number which may be competed for and gained, and the relative merit of the papers, Sic.

,. .. s

The papers of Competitors (accompanied with sealed letters, containing their names and addresses) to be left with the Secre­tary before the end of March 1824. The Prizes will be distri­buted to the successful Candidates at the General Meeting- in

O

May.

By order of the Council,

JOHN ROBISON, Secretary .

Edinburgh, May 1823.

Members of the Society mto whose hands this notice may fall , ate requested to have the goodness to disseminate it as much as lo slide among Artists, and others likely fo become Competitors.