176 Baf avian Society of the Sciences at ttaartcm, 



either already known or practised, or wliich can be brought 

 into practice, to kill them with the greatest speed and ?atety. 



To be ansu ercd before the 1 st ot November, 1 804 : 



T. How tar can the meteorological observations made ill 

 the Netherlands serve tor acquiring a knowledge of the 

 nature of the winds of these countries ? which are the most 

 prevalent winds ? what is their regular or general succes-* 

 sion ? from what previous circumstances can the inhabit- 

 ants on some occasions, and with any degree of certainty, 

 foretel changes of the winds ? and what intiuence have they 

 in general or sometimes on changes of the weather ? 



II. An accurate nomenclature of the mammalia, birds, 

 and amphibia, not formerly introduced, which arc found in 

 the Nethcrland-^, with their synonyms and the charac- 

 teristic marks of the species and genera arranged according 

 to the Linnoean system, with an indication of ouc or more 

 of the best figures of each animal. 



The following is proposed in consequence of the fund 

 established by the late director, N. W. Kops i 



IIL As it is of great importailce to the diffusion of each 

 branch of natural knowledge to have the principal truths 

 of It briefly and clearly exposed, the society requires that, 

 from the great number of writings on the action of the 

 Voltaic pile, whether given in journals or other periodical 

 works, an essay may be composed containing an account of 

 what has been leaxiicd in regard to the Voltaic pile and the 

 experiments made with it. 



The following questiorss are still proposed to be answered 

 under the usual conditions : 



For an unlimited period. 



I. What have we been taught by experience in regard to 

 the utility of some animals 'Ahich appear to be noxious,' 

 and especially in the Netherlands ? and what precautions 

 are to be emplo^-cd in order to extirpate them ? 



II. What indigenous plants, hitherto not tried, can be 

 employed with advantage hi the materia medica in the room 

 of exotic plants ? 



III. What indigenous vegetables, never yet used, can be 

 employed as .vholesome and cheap food ? and what Ibreign 

 Vegetables, not used in this couritry, can be introduced for 

 the same purpose ? 



IV. What indigenous plants, not yet used, are capable, 

 according to well established proofs, of furnishing good 

 dye-stuffs, which can be prepared and employed with ad- 

 vantage? and what exotics, fit for the same purpose, can be 

 introduced and cultivated on waste land with advantage ? 



The 



