1048 The American Naturalist. [November, 
Arts de Belgique has recently been made. In Natural Science the sub- 
jects for discussion are: (1). Original researches on the intervention 
of the phagocytesin the development of the invertebrates. (2). A de- 
scription of the phosphates and carbonates of Belgian soil. The de- 
scription must include the strata and locality of each mineral to which 
the writer refer. (8). Original researches concerning the peripheral 
nervous system of the Amphioxus, and, in particular, the constitution 
and genesis of the roots of the sensory nerves. (4). Original researches 
concerning the mechanism of the cicatrization of plants. 
The prize for each of the four divisions will be a gold medal, valued 
at six hundred francs. 
The memoirs must be written legibly, either in French or Flemish, 
and addressed post-paid to M. le secretaire perpétual, au palais des 
Académies, before the first of August, 1896. 
The Academy insists upon exact citations; the authors must give 
the editions and pages of the works cited. Only manuscript copy will 
be accepted. 
The competitors are requested not to use a pseudonym, but to adopt 
a device, which must be repeated on a card containing the name and 
address of the author and sent with the manuscript in a sealed envelope 
A prize cannot be awarded to any one who fails to comply with this 
formality. 
All memoirs sent after the limit of time has expired, or those whose 
authorship is made known in any way whatever, are excluded from 
the competition. 
The Academy reminds the competitors that when the memoirs are 
submitted for judgment, they must remain among its archives. How- 
ever, the authors may have copies made at their own expense, by 
addressing a note to that effect to the permanent secretary. 
The Jean Servais Stas prize is in the form of one thousand francs, to 
be awarded to the best work on the following subject : 
To determine, by original research, the atomic ide a of one or more 
elements for which the physical constant is now uncertai 
e memoirs must be legibly written in French or Flemish, They 
must be addressed, post-paid, to M. le secrétaire perpétual, au palais des 
Académies, before the first of August, 1896. 
The competitors will, in other respects, conform with the usual con- 
ditions of the annual contest. 
