PRIZE QUESTIONS, 
EXTRACT FROM THE PROGRAMME OF THE HOLLAND SOCIETY OF 
SCIENCES AT HARLEM, FOR 1865. 
The Society held its 113th annual session 20th May, 1865. Since the annual 
session of 1864 the society has published the following volumes of its acts : 
1. Vol. xix, 2d part, H. R. Géppert, Uber Einschliisse im Diamant. 
2. Vol. xx, lst part, P. Bleeker, Description de quelques espéces de Cobitioides 
et de Cyprinoides de Ceylon. 
3. Vol. xx, 2d part, P. Bleeker, Description des espéces de Silures de Suri- 
- name, conservées aux Musées de Leide et de Amsterdam. 
4. Vol. xxi, Ist part, Dr. Hermann Vogelsang, Die Vulkane der Eifel in 
threr Bildungsweise erldutert. 
5. Vol. xxi, 2d part, P. Duchassaing de Fonbressin et Giovanni Michelotti, 
.  Spongiaires de la mer Caraibe. 
6. Vol. xxii, 1st part, Joseph Barnard Davis, On Synostotic Crania among 
Aboriginal Races of Man. 
It has been decided that the memoir presented by M. J. Beissel de Borcette, 
Die Bryozoen der Aachner Kreidebildung, shall form part of the acts of the 
society. 
In Pio to. give greater publicity to the scientific labors of the savants of the 
Netherlands, the Society have decided to publish, at its own expense, in the 
French language, (or in Latin, for descriptive systematic memoirs,) the Nether- 
land Archives of the Exact and Natural Sciences, published by the Holland 
Society of Sciences at Harlem. 
The publication of this journal, which will contain as well original memoirs 
in extenso as translations or summaries of the memoirs of learned Netherlanders 
which have appeared elsewhere, will not be periodical, but will be regulated 
according to the number of memoirs presented. It will be edited by the per- 
petial secretary, M. EK. H. von Baumhauer, assisted by MM. R. von Rees, J. von 
der Hoeven, H. J. Halbertsma, and D. Bierens de Haan. 
The Society thinks proper to repeat the following questions, and requests that 
they be answered before the first of January, 1867: 
1. The fishes of the Indian Archipelago have engaged the researches of a 
learned Hollander. The Society desires that the other vertebrata of those 
islands, especially those of Borneo, Celebes, and the Moluccas, and, above all, 
those of New Guinea, should be the subject of a like examination. It will 
award its gold medal to the naturalist who shall send it either the description 
of some new species of mammifers, birds or reptiles of those islands, or a memoir 
containing new and remarkable facts regarding the structure and mode of life of 
some of those animals. 
*2. The Society desires as exact a determination as possible of the errors of 
the tables of the moon which we owe to M. Hansen, by the occultations of the 
Pleiades, observed during the last revolution of the node of the lunar orbit. 
3. The celebrated mechanician Ruhmkorff has obtained sparks of extraordi- 
nary length by the machines of induction which bear his name. The Society 
desires to obtain a determination, by theoretical and experimental researches, of 
the laws which govern the length and intensity of the sparks in machines of 
different size and construction. 
