306 Prize Subjects proposed by Harlem Society. 
mental and comparative, what is the function of the particu- 
lar matter secreted in the large intestine of many mammi- 
fera. This examination, forming the subject of the 7th 
prize, ought to embrace at least the Carnivora, Ungulata, 
and Rodentia. | 
8. To inquire if there is a well established relation be- 
tween the hypertrophies of the spleen and a morbid state 
of the blood characterised by an abundance of white 
globules (leucohemia). To illustrate this subject by anato- 
mico-pathological investigations and clinical observations. — 
9. With the view of terminating the uncertainty which 
always rests on the manner in which reproduction takes 
place in the Algae, the Society requires that it should be 
made the subject of new investigations, and that the de- 
velopment, from the embryo to the perfect state, of at 
least three plants belonging to different families, be ob- 
served, described, and as far as necessary illustrated by 
drawings. 
10. To show what are the characters by means of which, 
either by the examination of fossils or otherwise, it is pos- 
sible to decide with certainty whether the alluvium forma- 
tions have been deposited in fresh water, in water more or 
less saline, or in the sea. To confirm the exactness of the 
characters which shall be indicated, by the examination of 
different beds of the alluvium formations, whose origin is not 
doubtful. 
11. To make a thorough geological examination of the 
formation situated at the ancient embouchure of the Rhine, 
near Katwijk, in order to decide, if possible, by what causes 
it was closed up, whether violent cataclysm, or progressive 
encroachments of the land. To describe the vestiges which 
this embouchure has left. 
12. To give the geological and paleontological description 
of one of the inhabited Neerland Indian Archipelago other 
than the island of Java, and to determine the geological | 
epoch of the formations of the island. | 
The prize for each of these questions is a gold medal of — 
150 Dutch florins, to which may be added, if the Society 
think proper, a gratuity of the same value. The memoir - 
may be written, at the choice of the competitors, in any one — 
