The Dutch Society of Sciences at Haarlem have published their prize-list, in which they offer 2000 florins for the most important discovery in natural science which shall be made between the present year and 1856; and they propose sixty-one questions, the successful replies to obtain a gold medal worth 150 florins, and money to the same amount. Among them are:--The best geological description of the principal hot springs of Europe, their position, course, and quality, so as to show if they have any relation in common, and what relation exists between their changes and the changes caused by earthquakes, volcanoes, &c.--Whether, in any part of the old continents, there are dunes or sandbanks formed, at early geological periods, in the same way as those now existing on the coast of Holland--Whether the sea-level is higher or lower now than formerly with regard to the land-level of the Low Countries--On the wearing of coasts in past and present times, and the means of prevention--Whether a profitable manufacture of iodine may not be attempted on the shores of the Netherlands from certain marine plants and animals--Whether the _cinchona_ can be profitably cultivated in the Dutch colonies--On the influence of the nerves in the origin and progress of inflammation--Whether electricity, either static or dynamic, has anything to do with the production of Daguerreotype figures: and one that will interest ethnologists--The Laplanders are said to be the remains of a people who were once numerous over great part of the north, as the Basques are and were in the south; required, a description of the two, with peculiarities and craniological examinations and explanations in full detail. These are important questions, and well worth attention; the treatises may be written in Dutch, French, Latin, German, Italian, or English, so that aspirants to scientific honours in most parts of Europe have now the opportunity to prove their merits.