1 
Prizes for Essays and Reporti 
XII. Hop-Fly. 
Ten Sovereigns, or a Piece of Plate of that value, w ill be given by 
Major Curteis. M.P., for the best account of the hop-fly, and of the 
means for effecting its destruction or preventing its ravages. 
Competitors will be required to state — 
1. The natural historj- of the hop-fly in all its stages. 
2. The best remedy against its attacks on the hop-plant, and pre- 
ventive against its ravages by sowing other seed in hop- 
gardens, or by other means. 
3. Whether it attacks other plants ? 
4. Whether the disease in the hop-plant called '•' honey " is occa- 
sioned by the hop-fly, or arises from some other cause ? 
Tliese Essays must be sent to the Secretary, at 12, Hanover Square, London, 
on or before March \st, 1847, excepting the account of the Manure for Wheat, 
which must be sent on or before September \st. 1847. 
Contributors of Papers are requested to retain Copies of their Communications, as 
the Society cannot be responsible for their return. 
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 soiu-ces. 
2. Dra\\ings, 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 sealed 
cover, OH 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 Chairman 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 Essa_\ s wdl be returned on the apjilication 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 one 
of the Essays deserving of it. 
8. In all reports of experiments the expenses shall be accurately detailed. 
9. Tiie 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 option of the successful 
candidate. 
12. All Essays must be addressed to the Secretary, at the house of the 
Society. 
