442 PRIZE-QUESTIONS OF SCIENTIFIC SOCIETIES. 



submitted to it, and tlie propositions demonstrated clearly separated 

 from vague considerations and nnestablished facts. 



It repeats also that any memoir written in the author's hand will not 

 be received ; and that even when a medal has been awarded, the pre- 

 sentation will not be made if the author's hand has been recognized in 

 the mean time in the selected essay. The sealed envelopes sent with 

 unapproved essays will be destroyed unopened, unless it be discovered 

 that the work presented is only a copy from printed works, in which 

 case the author's name will be divulged. 



Every member of the society will be allowed to take part in the com- 

 petition on condition that his paper as well as the accompanying enve- 

 lope be signed with the letter L. 



The prize offered for a satisfactory answer to each of the questions 

 proposed consists, at the ]3leasure of the author, either of a gold medal, 

 struck from the ordinary die of the society and bearing the name of the 

 author and the date, or a sum of 150 florins. A supplementary award 

 of 160 florins may be made if the memoir be judged worthy. 



The competitor who receives the prize will not be allowed to print the 

 prize-essay, either separately or in any other work, without obtaining 

 for it the express permission of the society. 



The memoirs, legibly written in Dutch, French, Latin, English, 

 Italian, or German, (but not in German characters,) should be accom- 

 panied by a sealed envelope containing the name of the author, and 

 sent free to the secretary of the society, Professor E. H. von Baumhauerj 

 Harl6m. 



