xiv Prizes for Essays and Reports. 
4. Mode of mixing the bones with the acid, and of preparing the 
compost. 
5. Effect of various quantities applied in combination or comparison 
with common bones and other known manures. 
XI. White Mustard. 
Ten Sovereigns, or a Piece of Plate of that value, will be given for 
the best account of the Cultivation of White Mustard. 
Competitors will be required to attend to the following points : — 
1. Quality of land on which sown. 
2. Mode and time of sowing, and quantity of seed. 
3. Period of maturity, according to the season of the year. 
4. Application of crop, whether as green manure or to be fed off. 
XII. Drainage of Running Sands. 
Ten Sovereigns, or a Piece of Plate of that value, will be given for 
a description of the best method of Draining Running Sands. 
These Essays (with the exception of those in Classes VIII. and IX.) must 
be sent to the Secretary, at 12, Hanover Square, London, on or before 
March 1st, 1846. 
RULES OF COMPETITION FOR PRIZE ESSAYS. 
1. All information contained in Prize Essays shall be founded on experi- 
ence or observation, and not on simple reference to books, or other sources. 
2. Drawings, specimens, or models, drawn or constructed to a stated 
scale, shall accompany writings requiring them. 
3. All competitors shall enclose their names and addresses in a cover, 
on which only their motto, and the subject of their Essay, and the number 
of that subject in the Prize list of the Society, shall be written. 
4. The President or Chairman of the Council for the time being, shall 
open the cover on which the motto designating the Essay to which the Prize 
has been awarded is written, and shall declare the name of the author. 
5. The Ciiairman of the Journal Committee shall alone be empowered to 
open the motto-paper of such Essays, not obtaining the Prize, as he may 
think likely to be useful for the Society's objects, with a view of consulting 
the writer confidentially as to his willingness to place such paper at the 
disposal of the Journal Committee. 
6. The copyright of all Essays gaining prizes shall belong to the Society, 
who shall accordingly have the power to publish the whole or any part of 
such Essays ; and the other Essays will be returned on the application of the 
writers ; but the Society do not make themselves responsible for their loss. 
7. The Society are not bound to award a prize unless they consider »ne 
of the Essays deserving of it. 
8. In all reports of experiments the expenses shall be accurately detailed. 
9. The imperial weights and measures only are those by which calcula- 
tions are to be made. 
10. No prize shall be given for any Essay which has been already in print. 
11. Prizes may be taken in money or plate, at the ojjtion of the successful 
candidate. 
12. All Essays must be addressed to the Secretary, at the house of the 
Society. 
